HDTenEightyP/NetNews huggingface dataset:
From: jimt@titan.sanramon.sgi.com (James M Thompson)
Newsgroups: rec.bicycles.tech
Subject: Advice on Light Parts
Keywords: light Parts
Date: 29 Dec 92 18:49:58 GMT
Reply-To: jimt@titan.sanramon.sgi.com (James M Thompson)
Organization: Silicon Graphics Inc.

iI recently purchased  the DS2 shock for my Trek 950. I 've really noticed the
weight
increase of my bike since doing this. I am no in the process of  installing
lighter parts
on  the bike. I have installed lighter pedals ( a japanese made brand 265gr a
pair ),
Scott AT-LF2 bar, Control Stem , lighter Kevlar bead tires ( Specialized Ground
Control/S
and Ground Control Extreme ), lighter seatpost skewer and a lighter seat ( Vetta
Turbo 255gr).
I think I'm on the right track by installing the above but I am difficulty
finding  a lighter
than stock seatpost ( titanium is tooooo expensive ). I'd like to know if anyone
knows
of a manufacturer ( and PH # if possible ) that makes good/strong /light
seatposts
and if anyone has any comments on  how to better lighten my MTB I'd appreciate
it.

********************************************************************************
*********************************
James Thompson		SIlicon Graphics Inc
jimt@sgi.com		San Ramon, CA. 510 277-1940
Newsgroups: rec.bicycles.tech
From: ae505@yfn.ysu.edu (Frank Krygowski)
Subject: Re: Phil Wood hubs
Organization: Youngstown State University/Youngstown Free-Net
Date: Tue, 29 Dec 1992 05:52:54 GMT


For a solid axle, strength increases as the cube of the diameter.
The formula for the safety factor ... ignoring stress concentration
... would be:
                   Sy * pi * D^3
          FS =  ------------------
                    32 * M

Sy is yield stress, D^3 is diameter cubed, M is bending moment.
This is a quick & dirty first look, since you'd really be interested
in shock loads and/or fatigue, but the equation is good for steady
loads.  Anyway, double the diameter, and the axle is 8 times stronger.
(Also 4 times heavier.)

For a hollow one, it's more complicated, 'cause you get to play 
around with both the inside and outside diameters.  The similar
formula would be:

                   Sy * pi * (Do^4 - Di^4)
           FS = ----------------------------
                     32 * M * Do

where Do & Di are outside and inside diameters.  It's not a straight
proportion, because of that difference in diameters to the fourth
power, but the general idea is the same.  Strength is roughly
proportional to the cube of the diameter.  Of course, weight 
goes up unless you make the walls thinner.

Frank Krygowski  ae505@yfn.ysu.edu
Newsgroups: rec.bicycles.tech
From: ae505@yfn.ysu.edu (Frank Krygowski)
Subject: Re: Phil Wood hubs
Organization: Youngstown State University/Youngstown Free-Net
Date: Thu, 31 Dec 1992 15:48:16 GMT


Yes, if you keep wall thickness small enough compared to Do, 
you're right: it gets down pretty close to a proportion to Do^2.
On the other hand, if you choose to keep wall thickness a fixed
percentage of Do, it's exactly proportional to Do cubed. (Try
using Di = .9 * Do ).  As I said, you get to play with both 
inside and outside diameters, so it's more complicated.

The difference in these two strategies is interesting.  Fixing the
wall thickness means less increase in weight as Do increases, but
local buckling of the wall becomes the weak point, so you don't
get the benefit of the theoretical increase in strength.
... which is about where oversized steel frame tubes are, I'd guess.
A lower density material allows thicker walls, & thus bigger 
diameters before worrying about buckling.

Before we move this discussion to a new news group (how.many.
angels.can.dance.on.the.end..of.a.hollow.axle), didja ever look
at the strength to weight ratio of balsa wood?  Honestly, that
stuff is stronger (per poound or kg) than titanium!  Easy to
carve, too.  Should be able to make up some very lightweight 
frames or axles.

(For mountain bikes, it'd have to be pressure treated.
Unfortunately, that adds some weight.)
Frank Krygowski  ae505@yfn.ysu.edu
Newsgroups: rec.bicycles.tech
From: alh@einoed.in-berlin.de (Adrian Le Hanne)
Subject: Re: MTBs as racers
Organization: Einoed Unix & Netzwerke, Berlin (FRG)
Date: Tue, 22 Dec 1992 14:03:49 GMT

a_babel@pavo.concordia.ca (AARON BABEL) writes:

>	I own a Cannondale SM400 MTB, and I have found that it is just as
>light as my associate's Trek 1400, if not lighter.  Aware of the fact that I
>could replace my tires with slicks (Fatboys), but does anyone have practical
>experience in adapting MTBs for racing?  So, essentially I am asking as to 
>what would be the best brakes and gearing system which are made for C'dales,
>that will give my bike and me effective racing capabilities.  Also, does any-
>one know of the success rate of others who may have tried adapting their MTB
>for the road (i.e. in time trials)?

I'm in the process of building up a '93 'Dale frame as a 'road bike'. I will
using spare parts that i have lying around here (such as XT brakes/levers,
a Campy/XT wheel set, Litespeed stem etc.) Together with an Scott AT2-LF 
bar (looks like an MTB bar with steer horns) and a 50-11 gear it will give
me the opportunity to ride with roadies (except the air resistance maybe).
Due to the different steering geometry it is probably not good to use a 
drop bar (which is shorter than a MTB bar).

In summer a german or austrian MTB racer made it two place two in a road
race with a modified GT/Rock Shox setup. He set the Rock Shox to total 
lockout and used slicks and an aero bar setup, if i remember this right.

Adrian
-- 
Adrian S. Le Hanne        Einoed Unix & Netzwerke, Koepenicker Str.154, D-1000
alh@einoed.in-berlin.de   Berlin 36. Tel.: 030/611 31 26,  Fax.: 030/611 32 86
  "On a day such as this you should insist on more than the truth" -Pere Ubu
Newsgroups: rec.bicycles.tech
From: sjlt@leland.Stanford.EDU (Sean Lev-Tov)
Subject: Re: Sach-Maillard Aris Freewheel 7 spd SIS compat. ?
Organization: DSG, Stanford University, CA 94305, USA
Date: Sat, 2 Jan 93 06:20:02 GMT

In article <1993Jan2.061828.17569@leland.Stanford.EDU> sjlt@leland.Stanford.EDU (Sean Lev-Tov) writes:
>In article <1993Jan1.161809.5840@cc.umontreal.ca> barilj@ERE.UMontreal.CA (Baril Jude) writes:
>>
>>	I have a Phil Wood hub and i would like to find
>>a freewheel that will be SIS 7 spd compatible.  I already
>>have Shimano 105 shift lever (SIS 7s) and the rear derailleur
>>is a Deore DX.
>>
>>	My question is: Is Aris freewheels 7 spd are SIS
>>compatible and are they fit in a 126mm wide dropout ?
>>
>>	Thank you for your precious help and happy new year.
>>__
>>
>>Jude Baril
>
>I am using a Phil Wood hub with a Sachs 7-speed freewheel, a
>Deore LX rear derailleur, and an RX100 shift lever (a 105
>clone).  It indexes very well, just a notch below when I had
>a hyperglide cassete on there.  Therefore I don't think you'll
>have any problems.
>
>Sean
PS:  My dropout spacing is 126mm too.  I guess I don't know if
the Aris will work for sure.
Newsgroups: rec.bicycles.tech
From: ezag637@chpc.utexas.edu (Steve Manifold)
Subject: Phil Wood hubs
Organization: The University of Texas System - CHPC
Distribution: usa
Date: Tue, 22 Dec 92 20:08:12 GMT

I recently read somewhere that Phil Wood hubs have a feature in 
which instead of using quick-releases, you can clamp the hubs to 
the dropouts via a allen bolt and washer.  I assume the axle is 
threaded on the inside for this arrangement to work.  This seems
like a good way to save some weight (maybe 200 g).  Of course, 
you have to carry the appropriate hex key with you in case of 
emergencies.

Does anybody out there have anything like this? 

Thanks

Steve Manifold

-- 
_______________________________________________________________________________
Steve Manifold                                              University of Texas 
ezag637@hermes.chpc.utexas.edu                           College of Engineering
tasc637@crovax.cem.utexas.edu                       Center for Electromechanics
Newsgroups: rec.bicycles.tech
From: pamela@keps.kodak.com (Pamela Blalock)
Subject: Re: Allsop Suspension Seat Post
Organization: Kodak Electronic Printing Systems
Date: Thu, 31 Dec 1992 21:20:46 GMT

In article <1hvamuINNjrb@uwm.edu> rfriedel@csd4.csd.uwm.edu (Ronald J Friedel) writes:
>I called Allsop myself and found that they do sell their "beams" as a
>retrofit kit but not for the Burleys with oval tubing.  I got the 
>feeling that I was getting into "lawyers territory" so I stopped trying
>to order one at that point.

It's probably my fault that they won't sell one, since I kept
complaining about mine, prior to the fix. I suggested that if they
weren't going to make a proper clamp for oval tubes that they should
warn people prior to the purchase!

A framebuilder named Glen Swan built clamps for our Burley Rock n
Roll.  His shop is in Ithaca, NY. Call info for the number. (Glen Swan
Cycles) He may be willing to build more. If he's not, please let me
know, so I'll stop telling people about him.

Our new clamps have worked quite well.

BTW, Burley is now building a RnR with the Allsop integrated into the
design. They probably got tired of hearing from me too :)

pamela

-- 
Pamela Blalock                                    pamela@keps.com
KEPS, 164 Lexington Road                          12 down, I'm done
Billerica, MA 01821-3984                          time to start over!
Newsgroups: rec.bicycles.tech
From: EPLUS17@vmd.cso.uiuc.edu (Richard Engelbrecht-Wiggans)
Subject: Re: Phil Wood hubs
Organization: C.C.S.O.
Date: Wed, 30 Dec 1992 01:26:45 GMT

In article <1992Dec29.055254.14564@news.ysu.edu>
ae505@yfn.ysu.edu (Frank Krygowski) writes:
 
>
>For a hollow one, it's more complicated, 'cause you get to play
>around with both the inside and outside diameters.  The similar
>formula would be:
>
>                   Sy * pi * (Do^4 - Di^4)
>           FS = ----------------------------
>                     32 * M * Do
>
>where Do & Di are outside and inside diameters.  It's not a straight
>proportion, because of that difference in diameters to the fourth
>power, but the general idea is the same.  Strength is roughly
>proportional to the cube of the diameter.  Of course, weight
                     ::::
>goes up unless you make the walls thinner.
>
 
Let me factor that equation as follows:
 
        Sy * pi * ((Do:2+(Do-(Do-Di)):2) * (Do+(Do-(Do-Di)) * (Do-Di)
   FS =  ------------------------------------------------------------
                    32 * M * Do
 
Now, if the wall thickness Do-Di is mallish compared to the outside
diameter, then the first order approximation becomes
 
               Sy * pi * 2Do:2 * 2Do + (Do-Di)
   FS =  --------------------------------------------
                      32 * M * Do
 
Cancel a Do top and bottom, and you see that for fixed wall thickness,
the strength of tubing goes very nearly as the SQUARE as the diameter,
as I claimed earlier, not as the cube of the diameter.
 
..Richard E+17
 
 
Newsgroups: rec.bicycles.tech
From: sjlt@leland.Stanford.EDU (Sean Lev-Tov)
Subject: Re: Sach-Maillard Aris Freewheel 7 spd SIS compat. ?
Organization: DSG, Stanford University, CA 94305, USA
Date: Sat, 2 Jan 93 06:18:28 GMT

In article <1993Jan1.161809.5840@cc.umontreal.ca> barilj@ERE.UMontreal.CA (Baril Jude) writes:
>
>	I have a Phil Wood hub and i would like to find
>a freewheel that will be SIS 7 spd compatible.  I already
>have Shimano 105 shift lever (SIS 7s) and the rear derailleur
>is a Deore DX.
>
>	My question is: Is Aris freewheels 7 spd are SIS
>compatible and are they fit in a 126mm wide dropout ?
>
>	Thank you for your precious help and happy new year.
>__
>
>Jude Baril

I am using a Phil Wood hub with a Sachs 7-speed freewheel, a
Deore LX rear derailleur, and an RX100 shift lever (a 105
clone).  It indexes very well, just a notch below when I had
a hyperglide cassete on there.  Therefore I don't think you'll
have any problems.

Sean
Organization: Penn State University
Date: Wed, 23 Dec 1992 23:31:38 EST
From: <U3C@psuvm.psu.edu>
Newsgroups: rec.bicycles.tech
Subject: Help with Top Pull Der.!!!

Trek just replaced my mtb fram....I decided to upgrade to a 7000/8000
frame which has top tube cable routing.....They sent along with the
frame a top pull (I think) XC LTD front derallieur (Sp?)....The
problem is I have no idea how to run a cable to a top pull der. and
make it work (I can fix almost anything else on a bike....). Am I
stupid??? Can someone Help?????  Oh a added piece of info there is
a bolt between the chainstays where they meet the bottom braket shell..
is this part of the cable routing mystery???? AnywaY I would appreciate any
info leading to the completion of the assembly of my bike.....
Thanks in advance....steve
Newsgroups: rec.bicycles.tech
From: pardo@cs.washington.edu (David Keppel)
Subject: Re: B. Rohloff on Rohloff chains
Organization: Computer Science & Engineering, U. of Washington, Seattle
Date: Sat, 26 Dec 92 22:22:27 GMT


king@reasoning.com (Dick King) writes:
>[How can the non-round Rohloff holes help increase lateral flexability
> without sacraficing torsional rigidity?]

In a normal chain the pin inside the hole has a slightly smaller radius
of curvature than the hole.  The contact point between pin and hole is
small.  As the hole deforms under load the curvatures can match better,
but the deformation is driven by a point forces so the contact forces
are still uneven.

As I understand the Rohloff construction -- though I may, in USElessNET
tradition be completely wrong -- the hole is roughly triangular with
rounded points of a slightly smaller radius of curvature than the pin.
The rounded points of the triangular hole deform slightly under load,
ensuring a larger contact area between the pin and the hole.
radius of curvature for the rounded corners of the triangular hole as
the radius of curvature of the round pin

The characterization as `triangular with rounded points' is a gross
exageration to help form a mental image.  As I read the original
posting, the hole is, in fact, nearly round with three very short flat
segments.  That's the shape refered to as `trochide'.

Because the holes are non-round, the pin does not have the same degree
of freedom in all directions.  When you move a chain side-to-side the
slack-side pin move straight back.  When you twist a chain under load
the slack side moves up.  The non-round holes are supposed to have good
freedom for straight back, not so good for twisting.

That's my understanding of it, based entirely on the original post and
a bunch of head-scratching.  I've never tried a Rohloff chain.

	;-D on  ( On Roholoff chains?  Freebasing chains? )  Pardo
Newsgroups: rec.bicycles.tech,rec.bicycles.misc
From: frank@molbio.cbs.umn.edu (Frank Williams)
Subject: Re: Whoosh -- splat!!
Organization: University of Minnesota
X-Newsreader: Tin 1.1 PL5
Date: Wed, 23 Dec 1992 21:47:36 GMT

Les Earnest (les@sail.stanford.edu) wrote:
stuff deleted...

: I asked him how it worked and he explained that they put a helmet on a
: cadaver head with an accelerometer mounted in the center of the brain,
: then fire it into a wall to see what kind of accelerations they get
: inside the skull. 

What helmet manufacturer was it?  I'm curious because, as somewone who
has had the (dubious) privilege of teaching medical gross anatomy, I can
attest that cadavers are, well, different from you and I!  This does not
sound pretty.  I question the validity of the model because live brains
resemble Jello while embalmed brains resemble hard-boiled eggs.  This
research should be conducted on dummys and Dave Harveys.  Neither would
be permanently damaged, and variances would decline appreciably. :-)

: Just another warm-and-fuzzy Christmas story.
Ditto.

Frank Williams
From: delbert.big@hal9k.ann-arbor.mi.us (Delbert Big) 
Newsgroups: rec.bicycles.tech
Subject: Chain Maintenance
Date: 27 Dec 92 10:01:00 GMT
Distribution: world
Organization: HAL 9000, W-NET HQ, Ann Arbor, Michigan, USA
Reply-To: delbert.big@hal9k.ann-arbor.mi.us (Delbert Big) 

JB>I think the FAQ has enough information on this to satisfy the

I am new here and the terminology leaves me confused sometimes. 

What is a FAQ?
---
 . QNet3. . [WNet] 2/3 Board  Decatur, IL  217-877-1138  USR DS V32/V42b
                                
----
+------------------------------------------------------------------------+
| HAL 9000 BBS +1 313 663 4173 or 663 3959 | Four 14.4k v.32bis dial-ins |
| Public Access QWK-to-Usenet gateway running PCBoard 14.5a/E10/MULTITASK|
+------------------------------------------------------------------------+
Newsgroups: rec.bicycles.tech
From: trent@mpr.ca (Robert Trent)
Subject: Re: Computer Advice Needed
Organization: MPR Teltech Ltd., Burnaby, B.C., Canada
Date: Wed, 23 Dec 92 01:56:17 GMT

In article <1992Dec22.233241.6607@scott.skidmore.edu> mcobb@scott.skidmore.edu (mary cobb) writes:
>I have the cateye model you are referring to.  It's nice, except that the
>LCD display is painfully slow in winter riding (but it's LCD, what can you
>expect).  An annoying quirk it has is displaying random speeds on the screen
>when I'm riding at a constant speed (53, 103, 20 mph, etc.  One after the
>other.)  Then I ride over a series of bumps or something to jolt it and it's
>fine.  I hope that is because of low battery power.  Otherise, it's been fun
>to have.  IT does NOT auto stop and start, to my dismay (paper route timing
>is REALLY hard to get an avg. speed with start and sotp all the time.)  But
>altogether it's alright.
> 
>Eric

My cateye displayed the same problem.  It turned out that the sensor on
the front fork was too far (by a fraction of an inch) from the magnet attached
to the spokes.  I moved the sensor closer and experienced no more
180 mph readings!

I have a question...  Is anyone out there familiar with the Avocet 50
Altimeter computer?  Does it provide km, km/h, and meter (for evelation)
measurements?  Is its altimeter accurate - even when used in the rain/snow?
I'm worried that my riding would abuse an air-pressure sensor to death.

D
D
D
C
From: king@reasoning.com (Dick King)
Newsgroups: rec.bicycles.tech
Subject: Rube Goldberg device wanted...
Date: 24 Dec 92 00:03:40 GMT
Organization: Reasoning Systems, Inc., Palo Alto, CA

The Ultimate Chain Cleaner would...


   in a bath of clean solvent/lubricant...


      take apart, hold apart for a second or two, and then reassemble one
      link, and then step the chain to the next link.

      If you build it right you need not remove the bike from the chain, yet
      you would get far more grit out than you could hope to with any other
      method. 


      Tolerances in the hypothetical machine would be critical; the automatic
      reassembly has to be somewhere around 99.95% reliable [which would cause
      about one chain cleaning failure in twenty attempts].


This beast could be installed at bike shops.  You put your bike in the right
place, put a quarter in the slot, and wander around the shop for five minutes
while the beast grinds away.  Shop owners would love it because you would be
forced to window shop for five minutes per week while you're waiting to get
your steed back*.  Bike owners would love it because they are relieved of a
weekly messy chore.  System administrators would love it because the bicycle
FAQ would get 15% smaller, and newsgroup volume would decrease by 20% or more
(|;-) .  By presenting this idea to the general public i might even have atoned
to the world for all of the disk space consumed by .~n~ files in Gnu Emacs.


-dk


* The effort of cleaning the drool off the counter would be more than offset by
  an occasional sale
Newsgroups: rec.bicycles.tech
From: H.ZIERKE@BI-LINK.owl.de (Hans-Joachim Zierke)
Subject: Re: B. Rohloff on Rohloff chains
Date: Mon, 28 Dec 92 13:00:00 +0100
X-Mailer: CrossPoint v2.1 R/211
X-Gateway: ZCONNECT UI bi-link.owl.de [RFC/Connect IIIb DOS v0.46]


On 23.12.92, Bernhard Rohloff writes:


BR> High performance derailleur chains have to transmit very high
BR> forces of more than 400 kg (track racing, sprints and mountain
BR> biking). Test have shown that normal chains elongate 0,1mm
BR> per link or more under heavy load. 

  Plastic?
  Elastic?



Ciao
Hajo

--
Hans-Joachim Zierke  ##  Tel.: +49-30 / 394 8445  ##  Fax: +49-30 / 394 8447
                         h.zierke@bi-link.owl.de
Newsgroups: rec.bicycles.tech
From: ae505@yfn.ysu.edu (Frank Krygowski)
Subject: Re: Wheel Wonderings
Organization: Youngstown State University/Youngstown Free-Net
Date: Sat, 2 Jan 1993 17:48:06 GMT


Jobst Brandt says to beware of aero spokes, because they can't be
tightened enough to build a strong wheel... even by holding them
with pliers.

I'm curious about the failures you've observed.  My Cannondale
tourer has had Performance aero spokes in the front wheel (only)
for perhaps 3000 miles.  Those miles included a 3 week tour of 
Ireland (including some pretty rough roads) with heavily loaded
low riders + handlebar bag.  I don't imagine that the front spokes
were stressed anywhere near as much as the rear, (which is why
I used DT 14/15/14 on the rear)... but I think this is as harsh
a test as front spokes ever get.  They did fine.  In fact, the
wheel's never needed truing.

Anyone see failures with aero spokes?  

Frank Krygowski  ae505@yfn.ysu.edu
Newsgroups: rec.bicycles.tech
From: mcobb@scott.skidmore.edu (mary cobb)
Subject: Re: Computer Advice Needed
Organization: Skidmore College, Saratoga Springs NY
Date: Tue, 22 Dec 1992 23:32:41 GMT

I have the cateye model you are referring to.  It's nice, except that the
LCD display is painfully slow in winter riding (but it's LCD, what can you
expect).  An annoying quirk it has is displaying random speeds on the screen
when I'm riding at a constant speed (53, 103, 20 mph, etc.  One after the
other.)  Then I ride over a series of bumps or something to jolt it and it's
fine.  I hope that is because of low battery power.  Otherise, it's been fun
to have.  IT does NOT auto stop and start, to my dismay (paper route timing
is REALLY hard to get an avg. speed with start and sotp all the time.)  But
altogether it's alright.
 
Eric
Newsgroups: rec.bicycles.tech,rec.bicycles.racing
From: crick@tsp.med.umn.edu (Ed Crick (CD))
Subject: Re: Have a Dave Harvey Christmas!
Organization: University of Minnesota
Date: Wed, 23 Dec 1992 01:16:52 GMT

In article <31.1992.LID@lemond.harvey.com> dharvey@lemond.harvey.com (Dave "Hill" Harvey) writes:
>My fiancee, Nan, is REAL cute. I hope we love each by the date of the wedding.
>She's getting me a 57-tooth chain ring. I can't wait to try it out on the
>local tri-bobs. I can't stand those guys.
>
>    - Dave
>ZZ

  Dave, you weren't at Greg's restaurant (you know the name) but as I
recall, Nan sure seemed interested in that guy at the end of the table.
You weren't referring to the local, Wayzata/Plymouth tri bobs were you?
They'd eat you for breakfast (and undoubtedly expel you too).  Nan will
probably love somebody by the date of the wedding.

Ed
From: chris@carnival.lbl.gov (Chris Moll)
Newsgroups: rec.bicycles.tech
Subject: Re: MTBs as racers
Date: 21 Dec 1992 18:17:32 GMT
Organization: Lawrence Berkeley Laboratory, California
NNTP-Posting-Host: carnival.lbl.gov
Keywords: n

jrdodd@waikato.ac.nz (Jonathan) writes:
> One day a guy came out
>on a Bauer MTB with slicks and aerobars.  He had no trouble keeping up and his
>aero bars were well-used when riding at the front.  
...
> It could be a good idea to but some
>drops on (a la Tomac) and to try that out.

I put drop bars on my MTB as an experiment (for off-road riding).  Then,
when the rainy season started here, I put on slick tires just for the
hell of it.

My riding position was almost the same as on my road bike, but I didn't like
it.  The bike fell heavy and sluggish.  For some reason the steering felt
slow yet unstable; it was harder to maintain a straight course than on my
quick-steering road bike.  I could keep up with the road bikes, but I didn't
enjoy it.  I was under-geared; I got a lot of use out of the 46-12.

It was a relief to go back to my foul-weather road bike, even though it weighs
almost as much as the MTB.

--
Chris Moll                       (510)486-7891
---
A vacuum is a hell of a lot better than some of the stuff that nature
replaces it with.        -- Tenessee Williams
Newsgroups: rec.bicycles.tech