Help anyone please?

MarkEo
MarkEo Posts: 308
edited September 2009 in MTB workshop & tech
I have just finished building a bike, got it all working (i thought) took it out today for a test ride and when i pedal in a high gear the chain seems to jump/slip when i put pressure on the pedals, it works fine in the first couple of low gears but when i get past 3rd it jumps and slips anyone have any ideas why this happens?
Tis better to regret something you've done than to regret not doing something!

Comments

  • nicklouse
    nicklouse Posts: 50,673
    what is high gear?

    old parts or new parts?

    and a very poor topic heading!
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • MarkEo
    MarkEo Posts: 308
    sorry bout the heading, high gear is any thing from 4th - 8th, my cranks and cassete and back wheel is off of my old bike but the rear mech is new
    Tis better to regret something you've done than to regret not doing something!
  • MarkEo
    MarkEo Posts: 308
    Could it be my cassette do you think or maybe the fact that its a Truvativ crank and the rest is a Shimano set up? Although i dont know how this would make it slip?
    Tis better to regret something you've done than to regret not doing something!
  • andrewjoseph
    andrewjoseph Posts: 2,165
    Could be lots of things, is the chain new? you seem to have an 8 speed setup, but is the mech 8 speed?

    it could be that it's not indexed properly,

    are the shifters and rear mech compatible? e.g. some sram and shimano combinations are not compatible.
    --
    Burls Ti Tourer for Tarmac, Saracen aluminium full suss for trails
  • MarkEo
    MarkEo Posts: 308
    Yeh the shifters and rear mech are both shimano but the chain isnt, im sure my rear mech is 8 speed but is there any way of checking?
    Tis better to regret something you've done than to regret not doing something!
  • supersonic
    supersonic Posts: 82,708
    The mech makes no difference whether 8 speed, 9 speed.

    But the shifters have to match the rear cassette speed. As does the chain usually. Sounds to me that it is worn or needs fine tuning.
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  • nicklouse
    nicklouse Posts: 50,673
    so it happens in more than one rear gear?

    with what front cog?

    sounds like poor rear mech set up.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • andrewjoseph
    andrewjoseph Posts: 2,165
    I have run several different chains on my mtb, with either sram or shimano cassette, in my experience the chain used doesn't matter as much as good setup.

    Is the chain new? A new chain on a worn cassette can cause it to slip
    --
    Burls Ti Tourer for Tarmac, Saracen aluminium full suss for trails
  • MarkEo
    MarkEo Posts: 308
    I think iv sussed it, had a proper look and took every thing off and after a closer inspection i found a couple of missing teeth on a couple of cogs on my cassette so iv ordered a new one

    Thanks for the replies
    Tis better to regret something you've done than to regret not doing something!
  • andrewjoseph
    andrewjoseph Posts: 2,165
    Missing teeth? I've never had that problem.

    You are aware that most cassettes have teeth that are a different shape than the rest to aid gear changes?
    --
    Burls Ti Tourer for Tarmac, Saracen aluminium full suss for trails

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