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Thread: gears slipping

  1. #1
    Senior Member
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    gears slipping

    Hi,

    My bike has Ultegra components and low gears slip when climbing. I'm not sure of the exact teeth but I'd say that teeth 2-4 (going from low to high gear) on the rear cassette slip. It sometimes slips on flats but it's definitely noticeable when climbing. It's to the point where I'm either on gear 1 or gear 5 to avoid the gears slipping.

    I thought it might be a bad cassette but the old cassette was only about 4 months old. I bought a new cassette anyway but it's still slipping at the same place. I suppose it could be the chain but the chain is only 6 months ago.

    I did remove the rear cassette to install it on a new set of wheels. Is it possible for me to have messed up the teeth with the chain whip when I was removing / installing the rear cassette?


    Thanks.
    Rock.
    2012 Cervelo R3 w/ SRAM Rival
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    2012 Dahon Speed D7 - 9c 2806 rear hub motor + 12s 5ah lipo = 25mph
    2009 Trek 6500
    TidalForce S-750 electric bike - 9c 2807 rear hub motor + 14s 15ah lipo = 35mph

  2. #2
    Big Nerd msummers's Avatar
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    I would think that it likely has to do with pulley alignment or cable tension IF you're sure your chain isn't worn. (Usually this is a fault of your chain if you frequently change gears while hammering)

    If you have realigned the derailleur and reset the tension and your gears still slip, I would take it to an LBS so they can tell you if something is bent in the derailleur or on your hanger.

  3. #3
    cab horn
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    Quote Originally Posted by RVD72 View Post
    Hi,

    My bike has Ultegra components and low gears slip when climbing. I'm not sure of the exact teeth but I'd say that teeth 2-4 (going from low to high gear) on the rear cassette slip. It sometimes slips on flats but it's definitely noticeable when climbing. It's to the point where I'm either on gear 1 or gear 5 to avoid the gears slipping.

    I thought it might be a bad cassette but the old cassette was only about 4 months old. I bought a new cassette anyway but it's still slipping at the same place. I suppose it could be the chain but the chain is only 6 months ago.

    I did remove the rear cassette to install it on a new set of wheels. Is it possible for me to have messed up the teeth with the chain whip when I was removing / installing the rear cassette?


    Thanks.
    Rock.
    http://www.parktool.com/repair/readhowto.asp?id=64

    Check/test for twisted/frozen link. Then start thinking about replacing the chain/cassette. It is entirely possible to wear a chain out in 6 months.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  4. #4
    Senior Member
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    I would bet it's your chain - you may have a link or two that are slightly bent or stiff. I had similar problems with a chain that I had "dropped" off of the small chainring earlier this year. Turns out I had just slightly bent a couple of links. I replaced the chain and my problems were solved!
    Doug

    '72 Fuji Finest
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