Document ID: chunk:federal_register_of_legislation:F2018C00788:reg:60:p6
Version: federal_register_of_legislation:F2018C00788
Segment Type: reg
Provision Reference: reg 60 (pt 6/11)
Character Range: 37744–40545

(or bands), the figure as increased by the above tolerance may be exceeded by 8 mm.

         6.1.4.2.4. However, for tyres identified by the "tyre to rim fitment configuration" (see para. 3.1.10.) symbol "A", the overall width of the tyre, in the lower area of the tyre, equals the nominal width of the rim on which the tyre is mounted, as shown by the manufacturer in the descriptive note, increased by 20 mm.

6.1.5.  Tyre outer-diameter specifications

         The outer-diameter of a tyre must not be outside the values Dmin and Dmax obtained from the following formulae:

    Dmin = d + (2H . a)
    Dmax = d + (2H . b)

    where:

         6.1.5.1. for sizes listed in Annex 5, and for tyres identified by the "tyre to rim fitment configuration" (see para. 3.1.10.) symbol "A", the nominal section height H is equal to:

    H = 0.5 (D-d), for references see paragraph 6.1.2.

         6.1.5.2. for other sizes, not listed in Annex 5, "H" and "d" are as defined in paragraph 6.1.2.1,

6.1.5.3. Coefficients "a" and "b" are respectively:

6.1.5.3.1. Coefficient "a" = 0.97

6.1.5.3.2. Coefficient "b"         Radial, Run flat tyre         Diagonal and Bias Belted

    for ordinary

    (road type) tyres      1.04       1.08

         6.1.5.4. for snow tyres the overall diameter (Dmax) established in conformity with the above may be exceeded by 1 per cent.

6.2.  Load/speed performance test

         6.2.1.  The pneumatic tyre shall undergo a load/speed performance test carried out by the procedure described in Annex 7 to this Regulation.

         6.2.1.1. Where application is made for tyres identified by means of letter code "ZR" within the size designation and suitable for speeds over 300 km/h (see paragraph 4.1.15.), the above load/speed test is carried out on one tyre at the load and speed conditions marked on the tyre (see paragraph 3.1.4.1.).  Another load/speed test must be carried out on a second sample of the same tyre type at the load and speed conditions specified as maximum by the tyre manufacturer (see paragraph 4.1.15. of this Regulation).

         The second test may be carried out on the same tyre sample if the tyre manufacturer agrees.

         6.2.1.2.                        Where application is made for the type approval of a "run flat system" the above load speed test is carried out on one tyre, inflated as per paragraph 1.2. of Annex 7, at the load and speed conditions marked on the tyre (see paragraph 3.1.4.1.).  Another load/speed test must be carried out on a second sample of the same tyre type as specified in paragraph 3. of Annex 7. The second test may be carried out on the same sample if the manufacturer agrees.

         6.2.2.  A tyre which after undergoing the load/speed test does not exhibit any tread separation, ply separation,