Slipping/skipping

CS91
CS91 Posts: 16
edited September 2007 in MTB workshop & tech
I'm having a bit of trouble with my bike, its a GT Aggressor XC3. The problem is that when im pedalling hard, uphill/building speed/etc, usually in a high(ish) gear but sometimes in a lower one... It will skip or slip as i pedal... I have already had it back to the shop, and they replaced, a rear freehub(?), which made it better, but it's coming back... I will take it back AGAIN.... but i was hoping someone new what the problem is??

Thanks
Charlie....

Comments

  • deadpool2e
    deadpool2e Posts: 625
    It could be the chain has streched or the rear cassette has worn out (or front chain ring).

    I had the same problem when my chain had streched and when i replaced it i also had to get a rear cassette as it had danaged that.
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  • dav1
    dav1 Posts: 1,298
    The casette and chain will wear together so after a cirtain amount of chain streach both will have to be changed together. (guys on here told me that a coule of weeks ago :D)

    Cheak the teeth on the chainrings and cassetts, if the teeth are short and stumpy they are dead and you need new ones (you will know what a dead tooth looks like, they are noticably different)

    Had this problem with my old bike which I ran into the ground, the whole drivetrain had to be replaced.
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  • ddoogie
    ddoogie Posts: 4,159
    I'm surprised the shop replaced the freewheel first. Makes it an easy diagnosis now I suppose!
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  • supersonic
    supersonic Posts: 82,708
    Are the gears perfectly adjusted?
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  • CS91
    CS91 Posts: 16
    yep they replaced the rear freehub and the whole rear cassette/gear deely.... I think the gears should be adjusted fine.... Nothing on the bike should be particularly worn, its only 2 or 3 months old, and 3 weeks of that it has been sat around, waiting for the replacement parts....

    thanks
    Charlie
  • supersonic
    supersonic Posts: 82,708
    I'd check the fine adjustment, may be skipping between cogs. Make sure cable is clean and lubed too, and rthe mech hanger is not bent.
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  • trail jacker
    trail jacker Posts: 844
    ive got the same bike as you CS91, and ive had that problem. mine was fixed by halfords, but i reckon that the Acera gearing aint all that. may be worth saving up for some Deore. thats ma next planned upgrade :D
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  • Mr bump
    Mr bump Posts: 369
    I had a simalar problem and turned out to be a stiff joint in the chain. It wasnt bending and as a result it slipped like mad! Be worth looking at your chain.
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