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PostPosted: Mon May 07, 2012 2:43 pm 
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Joined: Mon May 07, 2012 10:28 am
Posts: 3
Location: Chiang Mai, Thailand
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?


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PostPosted: Mon May 07, 2012 3:44 pm 
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Joined: Mon Jan 23, 2006 6:35 am
Posts: 5072
Location: New York
Check bottom bracket it's possibly loose or worn.

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PostPosted: Mon May 07, 2012 6:44 pm 
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Joined: Mon Aug 16, 2010 6:43 pm
Posts: 438
Location: Canada
Your chainring could be out of round. try another chainring and see if you still have that issue..

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PostPosted: Mon May 07, 2012 11:33 pm 
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Joined: Thu Jan 08, 2009 1:41 pm
Posts: 227
Location: Shetland, Scotland
Sheldon has advice on centering chainwheels on fixed gears....
http://sheldonbrown.com/fixed.html


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PostPosted: Mon May 07, 2012 11:35 pm 
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Joined: Thu May 03, 2007 10:39 am
Posts: 2582
In addition to the above, check the cogs at rear and every single link in the chain to see if one has binded.

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PostPosted: Tue May 08, 2012 5:43 am 
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Joined: Mon May 07, 2012 10:28 am
Posts: 3
Location: Chiang Mai, Thailand
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.


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PostPosted: Thu May 10, 2012 11:29 pm 
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Joined: Sun Oct 09, 2011 1:09 pm
Posts: 148
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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