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  1. #1
    Senior Member
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    Slipping drivechain in granny ring?

    Hi, quick summary of my problem. My Fuji Roubaix double has recently started slipping in certain gears but ONLY when in the granny ring. If I switch to the big chainring no problems whatsoever. Any idea what this could be...rear mech adjustment? What's also weird is only certain rings on the rear sprocket cause this annoying slippage.

    I should also add that this bike has only done about 500-600 miles since new.

    Cheers

  2. #2
    My bike's better than me! neil0502's Avatar
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    What it couldbe? Sure. It could be--among other things:

    - rear derailleur adjustment
    - worn cogs on the cassette
    - improper cable tension on the rear der
    - rear wheel not perfectly centered in the dropouts

    There's a lot to check, but ... since you say the bike is so new ... I'd recommend taking it back to where you bought it and asking them to look at it for you. Under warranty, no?

  3. #3
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    Which cogs is it slipping in? The smallest? If that's the case then the rear derailleur doesn't have enough wrap capacity.

  4. #4
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    Last night I tried adjusting the rear mech but turns out its properly aligned anyway. I think it must be worn chain ring or cassette. I've isolated the problem in detail now:

    The chain slips randomly ONLY when I'm on the front granny ring and in gears 4 and 5 on the rear cassette. All other gear permutations are solid.

    Any other suggestions before I go and buy a new cassette and chain?

  5. #5
    (Grouchy)
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    check to make sure the cassette lockring is tight. sometimes if the cassette is loose, it could cause it to roll slightly on the freehub body and cause the chain to jump. this is not likely the solution to your problem, as most of the time it just causes sloppy shifting, but, it never hurts to check.

    try all the other suggestions first. it could also be cable stretch, but that usually happens sooner, and is more of an across the whole cassette issue.

    when in doubt, take it back to the shop you bought it from and have them look at it.

  6. #6
    cab horn
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    Another alternative should be considered - chainline.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  7. #7
    Senior Member
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    With only 500 - 600 miles it doesn't seem possible that the problem is due to wear. It's more likely that the shift cable needs adjusting. Go to the Park Tool web site and find the instructions for adjusting the cable. Normally a bike shop will make all necessary adjustments at the first tune-up cost free.

    Al

  8. #8
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    Quote Originally Posted by Al1943
    With only 500 - 600 miles it doesn't seem possible that the problem is due to wear. It's more likely that the shift cable needs adjusting. Go to the Park Tool web site and find the instructions for adjusting the cable. Normally a bike shop will make all necessary adjustments at the first tune-up cost free.

    Al
    But the chain physically slips on those sprockets I mentioned, why would that be due to cable tension? Also, wouldn't loose cable cause problems across all gears?
    Last edited by maximum01; 05-23-06 at 03:27 PM.

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