Rear gear issue

PinkSpider
PinkSpider Posts: 37
edited March 2011 in MTB workshop & tech
I'm having a bit of trouble with my rear gears on my two week old bike. Everything was fine until I took the back wheel off to change a tube and it's now occasionally randomly jumping gears as well as often being in the wrong gear (and I can only seem to get it into the lowest gear if I hold the lever in all the way, when I let go it then slides onto the second cog). Any ideas?

Cheers!

Comments

  • nicklouse
    nicklouse Posts: 50,675
    sounds like you have not fitted the rear wheel correctly.

    undo the Qr and put force on the addle before tightening it up fully.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • cooldad
    cooldad Posts: 32,599
    Or you bent the mech hanger if the wheel is in correctly.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • Checked and the wheel is tight in (and re-seated it just in case). Is the only other cause probably the mech being bent? And if so what are my options.

    The gears are fine on the highest cog, just seems to be a tiny bit too far away from the center of the wheel to be working.
  • cooldad
    cooldad Posts: 32,599
    Could be that the cable has just stretched if it's a new bike and just co-incidental with taking the wheel off.
    Index the gears and see. Follow Parktools link in Nick's sig.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • cooldad
    cooldad Posts: 32,599
    Which could also explain why it's not shifting into the lowest gear.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • nicklouse
    nicklouse Posts: 50,675
    PinkSpider wrote:
    Checked and the wheel is tight in (and re-seated it just in case). Is the only other cause probably the mech being bent? And if so what are my options.

    The gears are fine on the highest cog, just seems to be a tiny bit too far away from the center of the wheel to be working.

    so it is not going into the small cogs?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • cooldad
    cooldad Posts: 32,599
    Not going into the lowest according to first post, when he pushes the shifter so big cogs unless it's rapid rise, which I doubt.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • It's going into gear 2 (the second largest cog). It won't shift into gear 1 on the lowest setting unless you hold the lever in (the lever has a little give in between). Will check the cable in a sec. As it's shifting between two gears (in the mid range cogs) the cable being a very small amount out would make sense.

    Shall have a look at that guide too, played with my front derailer before but nothing on the back.
  • cooldad
    cooldad Posts: 32,599
    Back is easier. Loosen cable, set hi and lo limit screws. Tighten cable. Change down. Adjust for clean change, check up and down the cassette and it should be done.
    Front's are clumpy pigs to adjust.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • cooldad
    cooldad Posts: 32,599
    The Parktools webbie is an excellent resource. Covers pretty much everything, and explained well.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools