Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-24-06, 11:58 AM   #1
mrbertfixy
WTF?
Thread Starter
 
Join Date: Apr 2005
Location: livin' the dream
Bikes: trek cross, gt mtb, khs track
Posts: 462
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
in search of a better shim

i've had a cinelli XA 26.4 stem with 26.0 bullhorns for a while now, and haven't found a shim that holds the bars firmly enough to put all my weight on the ends, i mostly use the bars near the stem and the shoulders, so it wasn't really a problem. (i only have one 26.4 stem, but it's in a length i like) tried beer cans. someone said sparks cans were .0035" thick, so i went to the hardware store for something thicker. ideally .01" (.01"*25.4=.254 mm, .254*2=.58mm which is about the difference between 26.4 and 26.0).

they had a whole section of shims, strips of different metals in different widths and thickness. from .012" to .05. i ended up getting a strip of .018" stainless steel and a 6"x12" sheet of .033" brass perforated with 100 holes per square inch. i figured the holes would add some friction and keep things from moving. the perforation unfortunately tripled the price versus just a plain sheet.

i decided to use the brass sheet, and cut it to size. it was ***** to get in between the bars and the stem, especially since i didn't want to have to rewrap my bars, i kind of slid them back and forth trying to wedge the shim in there. i had to use a screwdriver to force the stem to open a little bit, since i was basically now trying to fit 27 mm bars into the stem. after tightening everything down, it seems good. put all my weight on the ends of the bars...solid.

between the brass sheet and the tin snips i got, it wasn't really worth it, i could have gotten a crappy stem that fit for that money. sometimes you just have to experiment.

eventually, all my stems will actually fit the bars they're on.

if anyone wants a shim from the perforated brass sheet, PM me. i'll drop it in an envelope and send it over.
mrbertfixy is offline   Reply With Quote
Old 04-24-06, 12:49 PM   #2
trons
yo yo yo yo yo
 
Join Date: Nov 2005
Location: delaware
Bikes:
Posts: 2,518
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
strange, i got soda cans to work for me for 25.4 to 26.0 on a cinelli 1a.
trons is offline   Reply With Quote
Old 04-24-06, 02:12 PM   #3
poopncow
MADE IN HONG KONG
 
Join Date: Aug 2005
Location: Washington DC
Bikes: some but not enough
Posts: 1,763
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sparks can = .0035 - guilty

K&S Engineering brass sheets in .010 (should work for 25.4 to 26.0 and for 26.0 to 26.4) available at better hardware stores and at hobby and craft stores near you.

btw: hint, the paper cutter at work or school make nice and crisp strips out of the brass sheets.

Ajax, if you PM your address, and width of your stem, I'll send you a strip.
poopncow is offline   Reply With Quote
Old 04-24-06, 02:25 PM   #4
Ya Tu Sabes
Rebel Thousandaire
 
Ya Tu Sabes's Avatar
 
Join Date: Sep 2004
Location: Hartford, CT
Bikes: Public D8, Yuba Mundo (cargo), Novara Buzz (1-speed, soon to be 2-speed w/ a kickback hub), Xootr 1-speed folder
Posts: 733
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've found that on some stem/bar combos, for reasons I can't understand, no shim will work - the bar always slides under enough pressure. I'm an advocate of drilling a small hole through the stem and into the bar and putting a tight-fitting bolt in there to function more or less like a cotter pin in cottered cranks and prevent movement. I've used this set-up on a fixie with 3-speed-type cruiser bars, and I routinely skidded and put a lot of weight on the bar without a problem. Some folks think my method is a recipe for missing teeth. Proceed with caution.
Ya Tu Sabes is offline   Reply With Quote
Old 04-24-06, 02:39 PM   #5
el twe
crotchety young dude
 
el twe's Avatar
 
Join Date: Jan 2005
Location: SF, CA
Bikes: IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
Posts: 4,818
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rockstar can for me. About a layer and a half.
__________________
Quote:
Originally Posted by CardiacKid View Post
I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
IRO Angus Casati Gold Line
el twe is offline   Reply With Quote
Old 04-24-06, 02:46 PM   #6
Kotts
Recreational Commuter
 
Join Date: Apr 2006
Location: Central Ohio
Bikes: Two brand-less build-ups.
Posts: 1,010
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by el twe
Rockstar can for me. About a layer and a half.
Reminds me of a passage in Zen and the Art of Motorcycle Maintainance in which Mr. Pirsig discusses the advantages of the beer can as a source of shim stock. Aluminum is easy to cut, deforms, and is slightly "sticky", all of which make it a perfect shim material.

Kotts
Kotts is offline   Reply With Quote
Old 04-24-06, 02:47 PM   #7
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Specifically Heneiken.
operator is offline   Reply With Quote
Old 04-25-06, 04:51 PM   #8
les walters
Senior Member
 
les walters's Avatar
 
Join Date: Mar 2006
Location: cape mother ****in cod
Bikes:
Posts: 125
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
just get the nitto shim it rocks
les walters is offline   Reply With Quote
Old 04-25-06, 09:22 PM   #9
mrbertfixy
WTF?
Thread Starter
 
Join Date: Apr 2005
Location: livin' the dream
Bikes: trek cross, gt mtb, khs track
Posts: 462
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i wasn't sure if the nitto shim was flexible or fixed to the 25.4 diameter. plus there is no lbs around here that carries them, i'd have to order online, pay shipping, wait, etc. even though the initial outlay was more than the nitto stem, now i know what to use and i have a bunch in case i have to use it again.
mrbertfixy is offline   Reply With Quote
Old 04-26-06, 02:00 AM   #10
wilcru
Senior Member
 
Join Date: Aug 2004
Location: Atlanta
Bikes:
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Why didn't you just use 3 sparks shims, or one long one that wrapped around the bars 3 times?
wilcru is offline   Reply With Quote
Old 04-26-06, 10:43 AM   #11
mrbertfixy
WTF?
Thread Starter
 
Join Date: Apr 2005
Location: livin' the dream
Bikes: trek cross, gt mtb, khs track
Posts: 462
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i tried two layers of beer cans, but the grooves in the stem kind of tore them apart.
mrbertfixy is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 07:02 AM.