Document:

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                                                                     EXHIBIT 4.1

                              AMENDED AND RESTATED

                          CERTIFICATE OF INCORPORATION

                                       OF

                           REPEATER TECHNOLOGIES, INC.

     Kenneth L. Kenitzer hereby certifies that:

     ONE: The date of filing of the original Certificate of Incorporation of
this corporation with the Secretary of State of the State of Delaware was
February 11, 2000.

     TWO: He is the duly elected and acting President of Repeater Technologies,
Inc., a Delaware corporation.

     THREE: The Certificate of Incorporation of this corporation is hereby
amended and restated to read as follows:

                                       I.

     The name of this corporation is REPEATER TECHNOLOGIES, INC.

                                      II.

     The address of the registered office of the corporation in the State of
Delaware is 9 East Lockerman Street, City of Dover, County of Kent, and the name
of the registered agent of the corporation in the State of Delaware at such
address is National Registered Agents, Inc.

                                      III.

     The purpose of this corporation is to engage in any lawful act or activity
for which a corporation may be organized under the General Corporation Law of
the State of Delaware.

                                      IV.

     A.   This corporation is authorized to issue two classes of stock to be
designated, respectively, "Common Stock" and "Preferred Stock." The total number
of shares which the corporation is authorized to issue is Seventy-Five Million
(75,000,000) shares. Seventy Million (70,000,000) shares shall be Common Stock,
each having a par value of one-tenth of one cent ($.001). Five Million
(5,000,000) shares shall be Preferred Stock, each having a par value of
one-tenth of one cent ($.001).

     B.   The Preferred Stock may be issued from time to time in one or more
series. The Board of Directors is hereby authorized, by filing a certificate (a
"Preferred Stock Designation") pursuant to the Delaware General Corporation Law
("DGCL"), to fix or alter from time to time the designation, powers, preferences
and rights of the shares of each such series and the qualifications, limitations
or restrictions of any wholly unissued series of Preferred Stock, and to
establish from time to time the number of shares constituting any such series or
any of them; and to increase or decrease the number of shares of any series
subsequent to the issuance of shares of

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that series, but not below the number of shares of such series then outstanding.
In case the number of shares of any series shall be decreased in accordance with
the foregoing sentence, the shares constituting such decrease shall resume the
status that they had prior to the adoption of the resolution originally fixing
the number of shares of such series.

                                       V.

     For the management of the business and for the conduct of the affairs of
the corporation, and in further definition, limitation and regulation of the
powers of the corporation, of its directors and of its stockholders or any class
thereof, as the case may be, it is further provided that:

     A.   The management of the business and the conduct of the affairs of the
corporation shall be vested in its Board of Directors. The number of directors
which shall constitute the whole Board of Directors shall be fixed exclusively
by one or more resolutions adopted by the Board of Directors.

     B.   Subject to the rights of the holders of any series of Preferred Stock
to elect additional directors under specified circumstances, the directors shall
be divided into three classes designated as Class I, Class II and Class III,
respectively. Directors shall be assigned to each class in accordance with a
resolution or resolutions adopted by the Board of Directors. At the first annual
meeting of stockholders following the closing of the initial public offering
pursuant to an effective registration statement under the Securities Act of
1933, as amended (the "1993 Act"), covering the offer and sale of Common Stock
to the public (the "Initial Public Offering"), the term of office of the Class I
directors shall expire and Class I directors shall be elected for a full term of
three years. At the second annual meeting of stockholders following the Initial
Public Offering, the term of office of the Class II directors shall expire and
Class II directors shall be elected for a full term of three years. At the third
annual meeting of stockholders following the Initial Public Offering, the term
of office of the Class III directors shall expire and Class III directors shall
be elected for a full term of three years. At each succeeding annual meeting of
stockholders, directors shall be elected for a full term of three years to
succeed the directors of the class whose terms expire at such annual meeting.
During such time or times that the corporation is subject to Section 2115(b) of
the California General Corporation Law ("CGCL"), this Paragraph B of this
Article V shall become effective and be applicable only when the corporation is
a "listed" corporation within the meaning of Section 301.5 of the CGCL.

     C.   In the event that the corporation is unable to have a classified board
under applicable law, including Section 301.5 of the CGCL, Paragraph B of this
Article V shall not apply and all directors shall be elected at each annual
meeting of stockholders to hold office until the next annual meeting.

     D.   No stockholder entitled to vote at an election for directors may
cumulate votes to which such stockholder is entitled, unless, at the time of
such election, the corporation (i) is subject to Section 2115(b) of the CGCL and
(ii) is not or ceases to be a "listed" corporation under Section 301.5 of the
CGCL. During this time, every stockholder entitled to vote at an election for
directors may cumulate such stockholder's votes and give one candidate a number
of

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votes equal to the number of directors to be elected multiplied by the number of
votes to which such stockholder's shares are otherwise entitled, or distribute
the stockholder's votes on the same principle among as many candidates as such
stockholder thinks fit. No stockholder, however, shall be entitled to so
cumulate such stockholder's votes unless (i) the names of such candidate or
candidates have been placed in nomination prior to the voting and (ii) the
stockholder has given notice at the meeting, prior to the voting, of such
stockholder's intention to cumulate such stockholder's votes. If any stockholder
has given proper notice to cumulate votes, all stockholders may cumulate their
votes for any candidates who have been properly placed in nomination. Under
cumulative voting, the candidates receiving the highest number of votes, up to
the number of directors to be elected, are elected.

     Notwithstanding the foregoing provisions of this section, each director
shall serve until his successor is duly elected and qualified or until his
death, resignation or removal. No decrease in the number of directors
constituting the Board of Directors shall shorten the term of any incumbent
director.

     E.   REMOVAL OF DIRECTORS

          1.   During such time or times that the corporation is subject to
Section 2115(b) of the CGCL, the Board of Directors or any individual director
may be removed from office at any time without cause by the affirmative vote of
the holders of at least a majority of the outstanding shares entitled to vote on
such removal; provided, however, that unless the entire Board is removed, no
individual director may be removed when the votes cast against such director's
removal, or not consenting in writing to such removal, would be sufficient to
elect that director if voted cumulatively at an election which the same total
number of votes were cast (or, if such action is taken by written consent, all
shares entitled to vote were voted) and the entire number of directors
authorized at the time of such director's most recent election were then being
elected.

          2.   At any time or times that the corporation is not subject to
Section 2115(b) of the CGCL and subject to any limitations imposed by law,
Section E.1 above shall no longer apply and removal shall be as provided in
Section 141(k) of the DGCL.

     F.   VACANCIES

          1.   Subject to the rights of the holders of any series of Preferred
Stock, any vacancies on the Board of Directors resulting from death,
resignation, disqualification, removal or other causes and any newly created
directorships resulting from any increase in the number of directors, shall,
unless the Board of Directors determines by resolution that any such vacancies
or newly created directorships shall be filled by the stockholders, except as
otherwise provided by law, be filled only by the affirmative vote of a majority
of the directors then in office, even though less than a quorum of the Board of
Directors, and not by the stockholders. Any director elected in accordance with
the preceding sentence shall hold office for the remainder of the full term of
the director for which the vacancy was created or occurred and until such
director's successor shall have been elected and qualified.

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          2.   If at the time of filling any vacancy or any newly created
directorship, the directors then in office shall constitute less than a majority
of the whole board (as constituted immediately prior to any such increase), the
Delaware Court of Chancery may, upon application of any stockholder or
stockholders holding at least ten percent (10%) of the total number of the
shares at the time outstanding having the right to vote for such directors,
summarily order an election to be held to fill any such vacancies or newly
created directorships, or to replace the directors chosen by the directors then
in offices as aforesaid, which election shall be governed by Section 211 of the
DGCL.

          3.   At any time or times that the corporation is subject to Section
2115(b) of the CGCL, if, after the filling of any vacancy by the directors then
in office who have been elected by stockholders shall constitute less than a
majority of the directors then in office, then

               a.   Any holder or holders of an aggregate of five percent (5%)
or more of the total number of shares at the time outstanding having the right
to vote for those directors may call a special meeting of stockholders; or

               b.   The Superior Court of the proper county shall, upon
application of such stockholder or stockholders, summarily order a special
meeting of stockholders, to be held to elect the entire board, all in accordance
with Section 305(c) of the CGCL. The term of office of any director shall
terminate upon that election of a successor.

     G.   Subject to paragraph (h) of Section 43 of the Bylaws, the Bylaws may
be altered or amended or new Bylaws adopted by the affirmative vote of at least
sixty-six and two-thirds percent (66-2/3%) of the voting power of all of the
then-outstanding shares of the voting stock of the corporation entitled to vote.
The Board of Directors shall also have the power to adopt, amend, or repeal
Bylaws.

          1.   The directors of the corporation need not be elected by written
ballot unless the Bylaws so provide.

          2.   No action shall be taken by the stockholders by written consent.

          3.   Advance notice of stockholder nominations for the election of
directors and of business to be brought by stockholders before any meeting of
the stockholders of the corporation shall be given in the manner provided in the
Bylaws of the corporation.

                                      VI.

     A.   The liability of the directors for monetary damages shall be
eliminated to the fullest extent under applicable law.

     B.   This corporation is authorized to provide indemnification of agents
(as defined in Section 317 of the CGCL) for breach of duty to the corporation
and its stockholders through bylaw provisions or through agreements with the
agents, or through stockholder resolutions, or otherwise, in excess of the
indemnification otherwise permitted by Section 317 of the CGCL, subject, at any
time or times the corporation is subject to Section 2115(b) to the limits on
such excess indemnification set forth in Section 204 of the CGCL.

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     C.   Any repeal or modification of this Article VI shall be prospective and
shall not affect the rights under this Article VI in effect at the time of the
alleged occurrence of any act or omission to act giving rise to liability or
indemnification.

                                      VII.

     A.   The corporation reserves the right to amend, alter, change or repeal
any provision contained in this Certificate of Incorporation, in the manner now
or hereafter prescribed by statute, except as provided in Paragraph B of this
Article VII, and all rights conferred upon the stockholders herein are granted
subject to this reservation.

     B.   Notwithstanding any other provisions of this Certificate of
Incorporation or any provision of law which might otherwise permit a lesser vote
or no vote, but in addition to any affirmative vote of the holders of any
particular class or series of the Voting Stock required by law, this Certificate
of Incorporation or any Preferred Stock Designation, the affirmative vote of the
holders of at least sixty-six and two-thirds percent (66-2/3%) of the voting
power of all of the then-outstanding shares of the voting stock, voting together
as a single class, shall be required to alter, amend or repeal Articles V, VI,
and VII.

                                     * * * *

     FOUR: This Amended and Restated Certificate of Incorporation has been duly
approved by the Board of Directors of this corporation.

     FIVE: This Amended and Restated Certificate of Incorporation has been duly
adopted in accordance with the provisions of Sections 228, 242 and 245 of the
General Corporation Law of the State of Delaware by the Board of Directors and
the stockholders of the corporation. A majority of the outstanding shares of
Common Stock approved this Amended and Restated Certificate of Incorporation by
written consent in accordance with Section 228 of the General Corporation Law of
the State of Delaware and written notice of such was given by the corporation in
accordance with said Section 228.

     IN WITNESS WHEREOF, REPEATER TECHNOLOGIES, INC. has caused this Restated
Certificate of Incorporation to be signed by its President this 14th day of
August, 2000.

                                       REPEATER TECHNOLOGIES, INC.

                                       By: /s/ KENNETH L. KENITZER
                                           -----------------------------
                                           Kenneth L. Kenitzer
                                           President

                                       5Exhibit 4.1
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                      AMENDMENT NO. 4
       TO NOTE PURCHASE AND PRIVATE SHELF AGREEMENT

         This Amendment No. 4 (this  "Amendment"),  dated as of June 2, 2000, to
the Note  Purchase and Private  Shelf  Agreement  dated as of July 10, 1996 (the
"Original  Agreement") is entered into between TBC  Corporation  (the "Company")
and The Prudential Insurance Company of America ("Prudential").

                         RECITALS

     WHEREAS, Prudential and the Company are parties to the Original Agreement;

     WHEREAS,  the Original Agreement has been amended by Amendment No. 1, dated
as of September 20, 1996, by Letter Amendment No. 2 to Note Purchase and Private
Shelf Agreement, dated October 28, 1998, and by Amendment No. 3 to Note Purchase
and Private Shelf  Agreement  ("Amendment  No. 3"),  dated January 21, 2000 (the
Original  Agreement,   as  so  amended,  being  referred  to  as  the  "Existing
Agreement");

     WHEREAS,  the  Company  plans to acquire  all of the  capital  stock of TKI
Holdings,  Inc.  and  its  wholly  owned  subsidiary  Tire  Kingdom,  Inc.  (the
"Acquisition");

         WHEREAS,  in connection  with the  Acquisition,  the Company desires to
enter into  Amendment  No. 1 (the "Credit  Agreement  Amendment")  to the Credit
Agreement,  (as in effect on the date  hereof  (except  as  otherwise  specified
herein),  the "Existing Credit Agreement";  and as in effect after giving effect
to the Credit Agreement Amendment, the "Credit Agreement"),  dated as of January
21, 2000,  among the Company,  First  Tennessee  Bank National  Association,  as
Administrative Agent, and the lenders party thereto;

         WHEREAS,  the Credit Agreement  Amendment  provides for, inter alia, an
increase in the amount available to be drawn thereunder and contemplates,  inter
alia,  a grant of a  security  interest  in certain  collateral  in favor of the
lenders thereunder and Prudential;

         WHEREAS,  the  Company has  requested  that  Prudential  agree to amend
various provisions of the Existing Agreement to enable the Company to consummate
the Acquisition and enter into the Credit Agreement Amendment, and Prudential is
willing to do so on the terms and conditions (including, without limitation, the
amendments to the Existing  Agreement) set forth in this Amendment (the Existing
Agreement, as amended by this Amendment, is referred to as the "Agreement"); and

         WHEREAS, terms used and not defined herein have the respective meanings
ascribed thereto in the Existing Agreement;

         NOW, THEREFORE, the parties hereto hereby agree as follows:

                                      -15-

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                                    AGREEMENT

1.       Amendments to Existing Agreement.   The  Existing  Agreement is  hereby
         amended as follows:

1.       Paragraph 6A(1).  Paragraph 6A(1) is hereby amended and restated in its
entirety to read as follows:

                       6A(1). WORKING CAPITAL. The ratio of Consolidated Current
                  Assets to Consolidated Current Liabilities to be less than (i)
                  at any time up to and including December 31,2000, 1.25 to 1.0,
                  and (ii) at any time after December 31, 2000, 1.75 to 1.0.

               (b)  Paragraph   6A(2).Paragraph  6A(2)  is  hereby  amended  and
          restated in its entirety to read as follows:

                       6A(2).  FIXED  CHARGE  COVERAGE  RATIO.  The Fixed Charge
                  Coverage Ratio (measured at the end of each fiscal quarter for
                  the then-most  recently ended four fiscal quarters) to be less
                  than (i) at any time up to and  including  December  31, 2000,
                  2.00 to 1.0,  and (ii) at any time after  December  31,  2000,
                  2.25 to 1.0.

               (c)  Paragraph  6A(3).  Paragraph  6A(3) is  hereby  amended  and
          restated in its entirety to read as follows:

                       6A(3)(i).  CONSOLIDATED TANGIBLE NET WORTH.  Consolidated
                  Tangible  Net Worth at any time to be less  than  $120,000,000
                  plus,  on a  cumulative  basis,  the sum of (i) fifty  percent
                  (50%) of positive  Consolidated  Net Income for each  complete
                  fiscal  year ended after June 30,  2000,  and (ii) one hundred
                  percent  (100%) of the net proceeds from the issuance and sale
                  of Qualified  Stock after the date hereof,  except pursuant to
                  the Company's  2000 Stock Option Plan and other employee stock
                  option,  stock appreciation and similar stock-based  incentive
                  plans  applicable  to directors  and  employees of the Company
                  existing  on the date hereof and listed on Schedule 6C hereof.
                  For  further  clarification,  in no  event  will  the  minimum
                  Consolidated  Tangible Net Worth  required to be maintained in
                  the previous sentence be reduced by the amount of any net loss
                  or deficit.

                         6A(3)(ii).     TIRE KINGDOM  CONSOLIDATED TANGIBLE  NET
                  WORTH. Tire  Kingdom  Consolidated  Tangible  Net Worth at any
                  time to be less than $25,000,000.

                 (d)  Paragraph 6B(1).  Subparagraph 6B(1)(v)  is hereby amended
          and

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         restated  in its entirety, and a new  subparagraph 6B(1)(x)  is hereby
         added, each to read as follows:

                         (v) Liens in  existence on the date hereof as set forth
                  on Schedule  6B(1)  hereto,  Liens on Property of Tire Kingdom
                  existing on June 2, 2000, and Liens  securing the  obligations
                  of the  Company  and  the  Subsidiaries  in  respect  of  this
                  Agreement and the Notes and any guaranty thereof.

                         (x) Liens securing  Indebtedness  outstanding under the
                  Credit  Agreement so long as the Notes are secured equally and
                  ratably therewith,  and the Intercreditor Agreement is in full
                  force and effect.

                 (e)  Paragraph 6B(2). Subparagraph 6B(2)(iii) is hereby amended
         and restated in its entirety to read as follows:

                         (iii) other Funded Debt of the Company (other than Debt
                  to any Subsidiary) and Subsidiaries, provided that

                                  (A)  the  aggregate  principal  amount  of all
                           Funded Debt of the Company  (including the Notes) and
                           Subsidiaries on a consolidated basis shall not exceed
                           (1)   sixty-five   percent   (65%)  of   Consolidated
                           Capitalization  at  any  time  up  to  and  including
                           December 31, 2000, and (2)  fifty-five  percent (55%)
                           of   Consolidated    Capitalization   at   any   time
                           thereafter;

                                  (B)  the  aggregate  principal  amount  of all
                           Adjusted  Funded Debt of the Company  (including  the
                           Notes) and Subsidiaries on a consolidated basis shall
                           not exceed (1)  fifty-five  percent (55%) of Adjusted
                           Consolidated  Capitalization  for all periods through
                           December 31, 2000, and (2)  forty-five  percent (45%)
                           of Adjusted  Consolidated  Capitalization at any time
                           after December 31, 2000;

                                  (C) [Intentionally Omitted];

                                  (D) the  aggregate  principal  amount of Total
                           Priority Debt shall not exceed fifteen  percent (15%)
                           of Consolidated Tangible Assets at any time; provided
                           that,  for the  purposes of this clause (D), all Debt
                           incurred  under or pursuant to this  Agreement or the
                           Credit   Agreement  shall  not  be  included  in  the
                           calculation of Total Priority Debt; and

                                  (E) [Intentionally Omitted];

                                      -17-

<PAGE>

                  provided  that,  with respect to each  calculation  under this
                  clause  (iii),  in the event that the Company  guarantees  any
                  Funded Debt of a Subsidiary or any  Subsidiary  guarantees any
                  Funded  Debt  of  the  Company  or  another  Subsidiary,   the
                  Indebtedness  in respect of all such  Guarantees  (other  than
                  Permitted  Subsidiary  Guarantees  and the  Permitted  Company
                  Guarantee)  shall be included as separate and additional items
                  of Indebtedness to that of both (a) the underlying Debt of the
                  primary obligor guaranteed thereby and (b) any other Guarantee
                  thereof by the Company or another Subsidiary,  as the case may
                  be.

                 (f)  Paragraph 6B(6).  Subparagraph 6B(6)(v) is  hereby amended
         and restated in its entirety to read as follows:

                               (v) the Company or any  Subsidiary  may otherwise
                  Transfer  assets,  provided  that after giving  effect to each
                  such  Transfer  (A) the sum of (1) the book  value of,  or, if
                  higher, the actual sales proceeds received in respect of, each
                  such  asset  Transferred  plus (2) the book  value of,  or, if
                  higher,  actual  sales  proceeds  received  in respect of, all
                  other  assets  Transferred  pursuant to this clause (v) during
                  the then  current  fiscal  year,  shall not exceed ten percent
                  (10%) of the Consolidated Tangible Assets determined as of the
                  final day of the fiscal year then most recently  ended and (B)
                  the  aggregate  book  value of,  or, if  higher,  actual  sale
                  proceeds  received  in  respect  of,  all  assets  Transferred
                  pursuant to this  clause (v) on or after April 1, 2000,  shall
                  not  exceed  twenty  percent  (20%) of  Consolidated  Tangible
                  Assets  determined as of the final day of the fiscal year then
                  most recently  ended,  provided,  however,  that the aggregate
                  amount of any actual  sales  proceeds  in excess of book value
                  shall be added to Consolidated Tangible Assets for purposes of
                  the calculations required in this clause (v).

                 (g)  Paragraph 6B(7).  Paragraph 6B(7) is  amended and restated
         in its entirety to read as follows:

                  6B(7).  SALE AND LEASE-BACK.  Enter into any arrangement  with
         any lender or  investor  or to which such lender or investor is a party
         providing  for the leasing by the Company or any  Subsidiary of real or
         personal property which has been or is to be sold or transferred by the
         Company or any  Subsidiary  to such lender or investor or to any Person
         to whom  funds  have  been or are to be  advanced  by  such  lender  or
         investor on the security of such property or rental  obligations of the
         Company  or any  Subsidiary  unless  (A) the  Transfer  of such  assets
         complies with  paragraph  6B(6) and (B) if the  obligations  under such
         lease  are  Capitalized  Lease  Obligations,   such  Capitalized  Lease
         Obligations are incurred in compliance with paragraph 6B(2).

                                      -18-

<PAGE>

                 (h)  Paragraph 6F.  Paragraph 6F is amended and restated in its
         entirety to read as follows:

                           6F.  Maximum  Leverage  Ratio.  The Company  will not
                  permit the Leverage  Ratio to be greater than (i) 3.75 to 1 as
                  of the end of any Fiscal Quarter ending on or before  December
                  31,  2000,  and  (ii)  3.50 to 1 as of the  end of any  Fiscal
                  Quarter ending thereafter.  "Leverage Ratio" at any time means
                  the ratio of the daily average outstanding principal amount of
                  Consolidated  Funded  Indebtedness  for each of the four  most
                  recent Fiscal  Quarters to the  aggregate  EBITDA for the four
                  most  recent  Fiscal  Quarters.   All  defined  terms  in  the
                  preceding   sentence  and  all  defined   terms  used  in  the
                  definitions of such defined terms have the respective meanings
                  ascribed  thereto  in the Credit  Agreement,  all of which are
                  incorporated herein in their entirety.

                 (i)  Paragraph  6G. A new  Paragraph  6G is hereby added to the
         Existing Agreement as follows:

                               6G.  Adjusted  Debt.  The Company will not permit
                  the ratio of (i)  Consolidated  Adjusted Debt as of the end of
                  any Fiscal  Quarter to (ii) EBITDA plus Rental  Payments  (for
                  the period of four Fiscal  Quarters  ending with and including
                  the final day of such Fiscal  Quarter) to be greater than 5.25
                  to 1.0. For the purposes of this  paragraph 6G,  "Consolidated
                  Adjusted  Debt"  shall mean Funded Debt of the Company and its
                  Subsidiaries (determined on a consolidated basis in accordance
                  with  generally  accepted  accounting  principals)  plus eight
                  times Rental Payments.

                 (j)   Revised  Definition.  The defined  term  "Funded Debt" is
         hereby amended and restated in its entirety as follows:

                              "Funded  Debt"  shall  mean,  with  respect to any
                  Person,  all Indebtedness of such Person which by its terms or
                  by the terms of any instrument or agreement  relating  thereto
                  matures,  or which is otherwise  payable or unpaid,  more than
                  one year from,  or is  directly  or  indirectly  renewable  or
                  extendible at the option of the debtor to a date more than one
                  year  (including  any option of the debtor  under a  revolving
                  credit or similar  agreement  obligating the lender or lenders
                  to extend  credit  over a period of more than one year)  from,
                  the date of the creation thereof; provided,  however, that all
                  Debt   outstanding   under  the  Credit   Agreement   (or  any
                  replacement  thereof) and all other  Indebtedness  owed to any
                  bank shall herein be considered  "Funded  Debt"  regardless of
                  when such Indebtedness matures or is otherwise payable.

                                      -19-

<PAGE>

                 (k)  New Definitions.  The following defined terms are added to
         paragraph 10B of the  Existing Agreement in  their proper  alphabetical
         order:

                  "Credit  Agreement"  means the  Credit  Agreement  dated as of
                  January 21, 2000,  among the  Company,  First  Tennessee  Bank
                  National Association, as Administrative Agent, and the lenders
                  party thereto,  as amended by Amendment No. 1 dated as of June
                  2, 2000.

                  "Guarantors"  means  Tire  Kingdom, Inc.,  Big O Tires,  Inc.,
                  Carroll's  Inc.,  Big  O  Development,  Inc.,   Big  O  Retail
                  Enterprises,  Inc.,   Big  O  Tire  of  Idaho, Inc.,  and  TBC
                  International, Inc.

                  "Rental Payments" means,  with respect to any period,  the sum
                  of the minimum amount of rental and other obligations required
                  to be paid during such period by the Company or any Subsidiary
                  as lessee under all leases of real or personal property (other
                  than  leases   creating  a  Capitalized   Lease   Obligation),
                  excluding  any  amounts  required  to be  paid  by the  lessee
                  (whether or not  therein  designated  as rental or  additional
                  rental) (a) which are on account of  maintenance  and repairs,
                  insurance,   taxes,  assessments,   water  rates  and  similar
                  charges, or (b) which are based on profits,  revenues or sales
                  realized by the lessee from the leased  property or  otherwise
                  based on the performance of the lessee.

                  "Tire Kingdom" means Tire Kingdom,Inc., a Florida corporation.

                  "Tire Kingdom  Consolidated  Tangible Net Worth" means,  as at
                  any   time  of   determination   thereof,   the   consolidated
                  stockholders' or shareholders'  equity of Tire Kingdom and its
                  Subsidiaries, less (i) the book value of all intangibles, (ii)
                  any net gains or losses attributable to cumulative translation
                  adjustments  and (iii)  minority  interests  held by any third
                  party in any Subsidiary of Tire Kingdom.

                  (l)   Defined Term "Credit Agreement".   Each reference to the
         defined term "New Credit Agreement" in the Existing Agreement is hereby
         amended to read "Credit Agreement".

2.       Waivers Relating to Sale and Leaseback Provision.  Any Default or Event
         of Default arising from the Company's failure to comply  with paragraph
         6B(7) of the Existing  Agreement at any time prior to March 31, 2000 is
         hereby waived.

3.       Subsidiary Guarantees.   In connection with the execution  of Amendment
         No. 3, the  Guarantors (other than Tire Kingdom) entered  into separate
         guarantees, dated on or about January 21, 2000, pursuant to which  they
         guaranteed the obligations of the Company under the Notes, the Existing
         Agreement and the

                                      -20-

<PAGE>

         Existing  Credit  Agreement.  In connection  with the execution of this
         Amendment, the Guarantors (other than Tire Kingdom) will reaffirm their
         obligations under said guarantees (the "Reaffirmation Agreements").  In
         addition,  Tire Kingdom  shall  execute a Guarantee  (the "Tire Kingdom
         Guarantee"), in form and substance satisfactory to Prudential,  whereby
         Tire Kingdom shall guarantee the repayment of the debt evidenced by the
         Notes and the Agreement.

4.       Conditions to Effectiveness. This Amendment shall become effective upon
         satisfaction of the following conditions:

                  (a)  Opinion.    Prudential shall have received an opinion of
         Thompson Hine & Flory LLP,  counsel  for  the  Company, dated  the date
         hereof, regarding:

                       (i)  the due incorporation and  valid  existence  of  the
                  Company   and  each  of  TBC International, Inc., Big O Tires,
                  Inc.,  and  Carroll's,  Inc.  ( collectively,  the "Specified
                  Subsidiaries");

                       (ii) the corporate  power and authority of the Company to
                  execute  this   Amendment   and  of  each  of  the   Specified
                  Subsidiaries  to  execute  the Tire  Kingdom  Guaranty  or the
                  Reaffirmation  Agreements,  as  applicable,  and the  Security
                  Agreements (as hereinafter defined) to be executed by it;

                       (iii) the taking of all necessary corporate action by the
                  Company  to  authorize  the  execution  and  delivery  of this
                  Agreement  and the Security  Agreement;  and the taking of all
                  necessary  corporate  action by each  Specified  Subsidiary to
                  authorize  the  execution  and  delivery  of the Tire  Kingdom
                  Guaranty or the Reaffirmation Agreements,  as applicable,  and
                  the Security Agreement to be executed by it;

                       (iv)  the  absence  of any  conflicts  between  (A)  this
                  Amendment,  the Agreement,  the Tire Kingdom  Guaranty and the
                  Security  Agreements and (B) the Credit Agreement or any other
                  agreement  known to such firm for money  borrowed to which the
                  Company or any Specified  Subsidiary (other than Tire Kingdom)
                  is a party,  or any guarantee known to such firm issued to the
                  lenders   under  the  Credit   Agreement  or  any  such  other
                  agreement; and

                       (v) the absence of any requirement to obtain any approval
                  of, or to make any filing with, any governmental  authority in
                  connection  with the  execution,  delivery and  performance of
                  this Amendment and the Tire Kingdom Guaranty.

                  (b)  Tire  Kingdom  Guaranty  and   Reaffirmation  Agreements.
          Prudential shall have received fully executed counterparts of the Tire
          Kingdom Guaranty

                                      -21-

<PAGE>

           and the Reaffirmation Agreements.

                  (c) Intercreditor Agreement. Each lending institution party to
          the  Credit  Agreement  shall have  executed  and  delivered  (in each
          capacity  in  which  it  is  a  party  to  the  Credit  Agreement)  an
          intercreditor agreement in the form of Exhibit A hereto.

                  (d) Credit Agreement Amendment. The Credit Agreement Amendment
          shall  have  been executed and delivered  by all  parties thereto, and
          shall be acceptable to Prudential in all respects.

                  (e) Security  Agreements.  Each of the Company,  Tire Kingdom,
          Big O Tires,  Inc.,  Carroll's  Inc.,  and Big O Tire of Idaho,  Inc.,
          shall have executed and delivered a Security  Agreement (the "Security
          Agreement"),   in  form  and  substance  satisfactory  to  Prudential,
          granting a security  interest to  Prudential in the Company's and each
          Guarantor's  accounts  and  inventory  to  secure,  in the case of the
          Company, its obligations under the Agreement and the Notes and, in the
          case of each of the Guarantors,  its obligations  under its respective
          Guaranty or the Tire Kingdom  Guaranty,  as the case may be. Except in
          the case of Tire Kingdom,  each such Security Agreement shall grant or
          assign to  Prudential  a first  secured  position  with respect to the
          collateral  covered  thereby,  subject  to  no  exceptions,  Liens  or
          encumbrances  other than those  permitted  by  paragraph  6B(1) of the
          Agreement. All filings of Uniform Commercial Code financing statements
          and all other  filings and actions  necessary  to perfect the security
          interests  and Liens  granted  under,  or assigned by, said  documents
          shall have been filed or taken and confirmation thereof received.

                  (f) Counsel  Fees.  The  Company  shall have paid the fees and
          expenses  of   Prudential's  special  counsel,  Bingham Dana  LLP,  in
          connection with the preparation,  negotiation,  execution and delivery
          of this Amendment.

                  (g) Transaction Fee. The Company shall have paid to Prudential
          a transaction fee in an amount equal to $53,350.

                  (h) Prepaid Interest Adjustment Fee.    The Company shall have
          paid to  Prudential a  prepaid  interest  adjustment  fee in an amount
          equal to $194,144.

                  (i)  Acquisition. The Acquisition shall have been consummated.

5.        Company  Representations.   The Company  represents  and  warrants  to
          Prudential  that  each of  its  representations  and warranties in the
          Credit Agreement Amendment is true and  correct as of the date hereof.
          In addition, the Company represents and warrants that  no   Default or
          Event of Default exists immediately

                                      -22-

<PAGE>

          prior to the  effectiveness  hereof  (except as indicated in Section 2
          hereof) or will exist immediately after giving effect hereto.

6.        Governing  Law.      This Amendment shall be construed and enforced in
          accordance with,  and the rights of the parties shall be governed  by,
          the internal laws of the State of New York.

7.        Effect  of  Amendment.   On  and  after  the effective  date  of  this
          Amendment,  each   reference  in  the  Agreement  to "this Agreement,"
          "hereunder," "hereof," or words of like  import, and each reference in
          the Notes to "the Agreement,"  "thereunder,"  "thereof,"  or  words of
          like import, shall mean the Existing Agreement as amended by this
          Amendment. Except as expressly provided herein, the Existing Agreement
          shall remain in full force and  effect and is in all respects ratified
          and confirmed.  This Amendment shall not operate as  a  waiver of  any
          Prudential's rights,  powers  or remedies,  nor constitute a waiver of
          any provision of the Agreement.  By its execution and delivery of this
          Amendment, Prudential consents to the Acquisition.

8.        Counterparts.   This  Amendment  may   be  executed  in  two  or  more
          counterparts, each of which shall be deemed an original, and  it shall
          not be necessary in  making  proof of this  Amendment  to  produce  or
          account for more than one such counterpart.

[Remainder of page intentionally blank; next page is signature page]

                                      -23-

<PAGE>

IN WITNESS  WHEREOF,  the parties  hereto have caused this  Amendment to be duly
executed  by their  respective  officers  as of the date  and year  first  above
written.

                                 TBC CORPORATION

                                 By: /S/ RONALD E. McCOLLOUGH
                                     ------------------------
                                 Name:     Ronald E. McCollough
                                 Title:    Executive Vice President, Chief
                                           Financial Officer and Treasurer

                                 THE PRUDENTIAL INSURANCE COMPANY
                                 OF AMERICA

                                 By: /S/ ROBERT R. DERRICK
                                     ---------------------
                                 Name:     Robert R. Derrick
                                 Title:    Vice President

                             GUARANTOR REAFFIRMATION

                  Each of the undersigned is a Guarantor pursuant to a guarantee
         dated as of January 21, 2000.  The  undersigned  hereby  consent to the
         execution  and delivery of this  Amendment  No. 4, and hereby  reaffirm
         that their  guarantees are in full force and effect with respect to the
         Agreement (as defined in this Amendment No. 4).

                                 BIG O TIRES, INC.

                                 By: /S/ RONALD E. McCOLLOUGH
                                     ------------------------
                                 Name:     Ronald E. McCollough
                                 Title:    Executive Vice President

                                 CARROLL'S, INC.

                                 By: /S/ RONALD E. McCOLLOUGH
                                     ------------------------

                                      -24-

<PAGE>

                                Name:     Ronald E. McCollough
                                Title:    Executive Vice President

                                BIG O DEVELOPMENT, INC.

                                By: /S/ RONALD E. McCOLLOUGH
                                    ------------------------
                                Name:     Ronald E. McCollough
                                Title:    Executive Vice President

                                BIG O RETAIL ENTERPRISES, INC.

                                By: /S/ RONALD E. McCOLLOUGH
                                    ------------------------
                                Name:     Ronald E. McCollough
                                Title:    Executive Vice President

                                BIG O TIRES OF IDAHO, INC.

                                By: /S/ RONALD E. McCOLLOUGH
                                    ------------------------
                                Name:     Ronald E. McCollough
                                Title:    Executive Vice President

                                TBC INTERNATIONAL, INC.

                                By: /S/ RONALD E. McCOLLOUGH
                                    ------------------------
                                Name:     Ronald E. McCollough
                                Title:    Executive Vice President

                                      -25-

<PAGE>

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