Singlespeed & Fixed Gear - chain loose...sorta, sometimes
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08-08-05, 03:10 PM
I am trying to figure out what causes this. Basically, I get my chain tight, rotate the wheel a bit, its loose, go further, ah, its tight again! I assume this is because the drivetrain is misaligned? Any thoughts?
08-08-05, 03:17 PM
Look at the section called "Chain Tension" at
http://sheldonbrown.com/fixed-conversion.html. It sounds like your chainring is not centered.
Paul And Pista
08-08-05, 03:17 PM
It's probably either an out-of-round chainring (don't worry, it happens to everybody sometime) or insanity. The former shouldn't be a big deal and you could get a nicer ring, if you'd like, but the latter you should definitely have checked out.
08-08-05, 03:29 PM
yeah, it definitely sounds like just an untrue chainring.
pretty common and nothing you can really do about it.
either deal with it or buy a new/nicer one.
08-08-05, 03:40 PM
I have never seen a drive train that does not do this to some extent, there are greater and lesser degrees of loose to tight. Centering the ring will help, but not, I think, eradicate the problem completely. Actually, I don't really consider it a "problem". That's just how it is. Don't worry. It's okay. Just make sure the chain doesn't bind too much on the tight spots or get too loose on the loose spot.
From my understanding, you rotate the ring until you find the most nuetral revolution of the cranks. But, it is not something you will completely eliminate, as ELC has noted. I just live with it.
Also, I have been told that the Shimano D/A track rings are the truest. Having better tolerances than the Suginos I use. But, they cost $$$.
08-08-05, 04:10 PM
Yeah, its a fairly new FSA. I tried the chainring centering thing(htanks for the link 3niktac), seems that takes some getting used to. I can probably learn to live with it...
08-08-05, 05:50 PM
hey somebodies. the p. floyd quote in your sig cracked me up...it took me a minute to dust off where i'd heard that line, and then i "got it"...very nice.
those FSAs are like sheets of metal...so it seems weird it'd be out of round already. i have one too, and the Sheldon centering technique, while not perfect, helped quite a bit.
08-08-05, 07:52 PM
I don't think I was insane before I discovered this "problem" but its driving me nuts. How oh how can it be?!
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