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  1. #1
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    Nov 2007
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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.

  2. #2
    Senior Member
    Join Date
    Sep 2006
    Location
    Spencer, IN
    My Bikes
    Trek 5200
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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.

  3. #3
    Newbie
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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?

  4. #4
    Senior Member
    Join Date
    Mar 2007
    Location
    Louisville, KY
    My Bikes
    Trek Madone 5.5, Klein Q Pro Elite, Surley LHT
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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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