Slack and stiff chain on my track bike

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ianf
Posts: 3
Joined: Mon May 07, 2012 10:28 am
Location: Chiang Mai, Thailand
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by ianf

Recently my track bike that I use at the Chiang Mai velodrome has developed a problem in that as I rotate the pedals, the chain is very taut at one point and incredibly slack at another. I've checked the chain (1/8th) for wear and that's ok; The chainring is a newish Campagnolo Pista 52-tooth and seems perfectly ok; the frame is inline (check in a decent bike shop) so I am at a loss ..... The main problem it causes is when really winding it up, I get harsh noises and the fear that the chain will jump off. Any help available?

by Weenie


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stella-azzurra
Posts: 5072
Joined: Mon Jan 23, 2006 6:35 am
Location: New York

by stella-azzurra

Check bottom bracket it's possibly loose or worn.
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crohnsy
Posts: 439
Joined: Mon Aug 16, 2010 6:43 pm
Location: Canada

by crohnsy

Your chainring could be out of round. try another chainring and see if you still have that issue..

CarlosFerreiro
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Joined: Thu Jan 08, 2009 1:41 pm
Location: Shetland, Scotland

by CarlosFerreiro

Sheldon has advice on centering chainwheels on fixed gears....
http://sheldonbrown.com/fixed.html

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Tapeworm
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Joined: Thu May 03, 2007 10:39 am

by Tapeworm

In addition to the above, check the cogs at rear and every single link in the chain to see if one has binded.
"Physiology is all just propaganda and lies... all waiting to be disproven by the next study."
"I'm not a real doctor; But I am a real worm; I am an actual worm." - TMBG

ianf
Posts: 3
Joined: Mon May 07, 2012 10:28 am
Location: Chiang Mai, Thailand
Contact:

by ianf

Thanks for your help. I had a new 50-tooth Stronglight chainring and that seems to have been the problem. After flaffing about for an hour I changed the chainring for an old-style Campagnolo 51 -tooth and what do you know? Perfection. Thanks for your help guys.

by Weenie


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horse
Posts: 148
Joined: Sun Oct 09, 2011 1:09 pm

by horse

Your problem is sorted.
Chain wear is usually uneven and is also the culprit. Possibly the worst thing about track bikes is the drivetrain and having it remain correct.

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