|Fixed gear - chain/noise/tension question||mass_biker|
Nov 12, 2002 3:32 AM
|On the new old ride (fixed gear I just built up), the drivetrain makes an awful racket when under pressure (i.e. standing on the pedals, starting from a dead stop etc.) - it's as if with each downstroke it protests vocally. No such noise when just spinning along. Chain tension/tightness seems reasonable - tight enough to keep it on the cog, loose enough so that the wheel can turn. Using a standard fixed cog (16T) in rear with a Campy crankset up front (39) and a cheapo (non indexed, not narrow) chain. No kinks, tight spots in chain as far as I can tell, and the chainline is dead straight also.
|re: Fixed gear - chain/noise/tension question||micha|
Nov 12, 2002 4:05 AM
|Most fixed cogs you buy are old technology - very old technology. There's no precise chamfering of the teeth and there's probably some runout. Eventually the chain and cog will mate nicely and the noise under load will diminish. |
That's my experience from riding track 20 years ago. Things may have changed since then.
|are you using 3/32" pitch chain and cog?||Tig|
Nov 12, 2002 6:49 AM
|Its a basic question that has to be asked since we can't see it. Since the chain ring is 3/32", the rest of the drive train should match and not be 1/2" pitch for the best operation. Also, a wide 1/8" cog won't mate to the modern width derailleur chains. Go to http://www.sheldonbrown.org/fixed-conversion.html and scroll down to Drive Train for help with a few things including chain tension.|
Nov 12, 2002 7:06 AM
|Funny enough, I got the Sovos flip/flop hub I am using from Harris Cyclery (home of Sheldon Brown) about 3 years ago. I think the 16T that I got at the time was standard - don't know if that makes it 1/8" or 3/32" though. It worked okay with my old crank/chain for over a year, but the new crank/chain are definitely causing it some grief, especially under high torque. Perhaps the cheap ($8 no-name) chain is too wide for the crank/cog combo? It seems like it is coming down to a case of matching the cog pitch to the crank pitch and chain width, since all other variables (chain line, chain tension) seem to be okay.
|small correction . . .||micha|
Nov 12, 2002 8:54 AM
|Good advice from tig. But pitch is distance between one chain roller and the next. All chains nowadays are 1/2" pitch. What's being discussed is chain width only. |
Don't mean to be a jerk, but seeing the word "pitch" used for roller spacing and/or chain width can be confusing.
|re: Fixed gear - chain/noise/tension question||brider|
Nov 12, 2002 8:23 AM
|Even a well-dialed track set-up is going to make some noise -- just part of the territory. As for tension, you should be able to move the chain up and down about 1/4 inch.|
|And you're sure the noise isn't coming from your knees? (nm)||czardonic|
Nov 12, 2002 1:19 PM