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Old 11-17-07, 10:34 AM   #1
takiguy
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Bike 'jumps' when pedaling hard/uphill in high gears

Hello,

I just bought a used Trek Mountain Track 800 for $120. I didn't get a good chance to test it beforehand, and I have very little experience doing anything with bikes other than replacing a punctured tire.

The problem is: whenever I am putting a lot of pressure on the pedals and pedaling hard -- ie on hard uphill climbs -- the pedals will 'jump.' It happens a lot when rear gears are in the 4 highest (4,5,6,7), and front is in the highest (3).

I looked at the chainring, and the teeth are a little bent. The "cogs" on the rear cassette look ok. I don't know very much about the chain itself other than it doesn't look bent :\.

Is it jumping because the teeth are bent on the chainring? Should I get a wrench/vice and try to straighten the teeth? Is there something wrong with the chain? Derailleur? I'm not sure how to fix much of anything, and I am just now learning all the parts of the bicycle, but I bought this bike partially for riding and partially to learn how to fix things (which I am not very good at). What can I do? Thanks.
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Old 11-17-07, 10:37 AM   #2
matthew_deaner
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This problem gets posted all the time...
Your chain is skipping due to wear of the chain and frreewheel/cassette. Get a new chain and freewheel/cassette, and the problem will probably go away. You might need new chainrings too.
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Old 11-18-07, 05:11 AM   #3
takiguy
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Where should I go to get the best chainring/chain/cassette for my buck? Which ones should I look at getting for my bike (Trek Mountain Track 800)? Should I bother trying to install myself or will it be too difficult?
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Old 11-18-07, 08:46 AM   #4
kycycler
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Any LBS can get you a good chain/cassette combo. I would try either Sram of Shimano.
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