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Help please – Chain slipping badly when applying pressure

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  • March 9, 2015 at 8:39 pm #23453
    Haggisbasher

    Hello all

    Looking for some pointers/help.

    I recently measured chain and was shocked to see that after 8 months and 3000km the chain has stretched to over 1%. I replaced the chain, and when out riding I started to get terrible chain slip (not slipping up and down the gears) but riding over, i think the cassette. Prior to the chainswap I had no problems, hving been out in strong winds and pedaling hard.

    I thought the cassette might also be worn or the pawls so checked with three other wheels and cassettes, still same problem. Thought it might be a duff chain, so changed that, no difference. Thought on the off chance that all cassettes were worn, so bought new one (slowly, buying new groupset part by part here). I had a look at the front small chainring and it looks slightly worn but not bad. The slip only occurs when I am in the small chainring at the front and the 4-5 smallest gears at the back (yeah i know I shouldnt be crosschaining)

    Could worn jockey wheels cause the chainslip? (these are even newer about 7 months and are Hope jockey wheels) or is it more likely the front chainring. Options left are new derailleur or chainring.

    An thoughts greatly appreciated.

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Viewing 9 replies - 46 through 54 (of 54 total)
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  • March 9, 2015 at 10:41 pm #835771
    0
    RR

    It’s also worth checking the
    It’s also worth checking the gear cable. If there is a kink in it, or if the outer is damaged or not properly seated somewhere, then that can act a bit like a spring and cause similar behavior.

    March 9, 2015 at 10:36 pm #835769
    0
    Haggisbasher

    Checked the lock ring on all
    Checked the lock ring on all 4 cassettes, no joy.

    I swapped like for like in terms of cassette, and measured the number of links on the old chain and copied that for the first new chain, the second chain I actually fitted the chain, with help the old fashioned way, worked out same amount of links.

    I really do appreciate the help, it just reinforces everything, I have tried and I have missed noting obvious.

    March 9, 2015 at 10:22 pm #835767
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    Wilts Cyclist

    I had this problem on new
    I had this problem on new bike when I swapped the cassette out for a new 11-28 (from 11-25) and replaced the chain at the same time – I figured I’d need a slightly longer chain. Despite careful measurement the chain was too long, it had too much slack and slipped – particularly when under pressure, changing gears or over rough bits of road. I just shortened the chain of course, worked fine ever since.

    March 9, 2015 at 10:06 pm #835765
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    SPAM Naval

    Check that you tightened the
    Check that you tightened the lockiring fully on the new cassette and there is no play in the cassette on the free hub..
    I do find when I change my chains and cassettes that sometimes (and I’ve never worked out why!) it takes a few rides to settle in, as initially I do experience chain skip..

    March 9, 2015 at 9:52 pm #835763
    0
    Haggisbasher

    At this point there are no
    At this point there are no silly questions. Yes the first chain was a KMC 10 speed chain, with a 10 speed fast link. The second was a different KMC chain, 10 speed (stamped on it)

    March 9, 2015 at 9:37 pm #835761
    0
    lisa76uk

    Silly question, but you’ve
    Silly question, but you’ve bought the right width chain? Could cause the slipping issue. Road chains are generally 3/32″, 11 speed is slightly narrower than 8/9/10 speed. single speed/fixed is different altogether at 1/8″.

    March 9, 2015 at 9:34 pm #835759
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    Haggisbasher

    Thanks, I have tried 3
    Thanks, I have tried 3 different cassettes on three different wheels, still slipping. even bought a new cassette today.

    It does not seem to slip on the front chainring, but that could be simply unable to push as hard on them, dunno. The front looks more worn than the smaller chainring. I tend to use the larger chainring more.

    Changed jockies over tonight and still slipping. It must be a wear issue as it was all okay and smooth as a babies bottom prior to chain change.

    March 9, 2015 at 9:16 pm #835757
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    mrmo

    i would look to the cassette,
    i would look to the cassette, very unlikely to be the chainring. The attached was what was left of a Campag Record Chainring when it started to slip.

    Jockey wheel is likely to show as worse shifting in my experience.

    March 9, 2015 at 8:50 pm #835755
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    Man of Lard

    Is it the same on all front
    Is it the same on all front rings? If not then you need to replace the one that’s worn (just had exactly the same – replaced cassette & chain – slipfest on one ring – ring replaced, happy days)

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