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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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  • January 11, 2019 at 9:54 pm #835861
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    el_greco

    Ancient thread I know but if

    Ancient thread I know but if (like me) someone stumbles upon it, I had this problem on a just purchased second-hand bike where the inner chain ring was the wrong way round. The teeth are not symmetrical and the chain can ride up and over the bevel when the ring is flipped.

    It wasn’t obvious to me even when I was looking for it. But if you run a straight edge from the centre to the teeth you can see it clearly. Any markings on the (inner) ring should face towards the bike.

    April 5, 2016 at 10:01 pm #835859
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    wycombewheeler

    CycloRoss wrote:

    CycloRoss wrote:

    I have been having the exact same problem with my bike chain recently! When I replaced the rusty old chain and matched the length of it with the new one, the chain doesnt grip in and hops on the same cassette when I thrust (standing up while cycling/ picking up speed). Is the cassette the only reason you think?

     

    If your old chain was slipping due to wear, then likely the cassette would be worn too and a new chain will slip on that.

    April 5, 2016 at 8:52 pm #835857
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    CycloRoss

    I have been having the exact

    I have been having the exact same problem with my bike chain recently! When I replaced the rusty old chain and matched the length of it with the new one, the chain doesnt grip in and hops on the same cassette when I thrust (standing up while cycling/ picking up speed). Is the cassette the only reason you think?

     

    March 16, 2015 at 5:44 pm #835855
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    Pub bike

    Haggisbasher wrote:The inner

    Haggisbasher wrote:
    The inner chainring was not really worn, and certainly not as bad as the outer.

    How many miles had you done since you got that chainset (bike?), and what proportion on inner versus outer do you typically ride?

    Taking another look at your photo above, although it could be because the bike was on its side, the chain is lifting off on the top of the inner, which suggest wear according to [url=http://sheldonbrown.com/chains.html/]this[/url].

    The outer looks very worn also, with some teeth appearing to point forwards, but it is harder for the chain to slip on the outer because there are more teeth holding the chain further around.

    March 16, 2015 at 5:15 pm #835853
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    Haggisbasher

    Thanks for the input though.
    Thanks for the input though.

    To be truthful, it wasn’t my 1st, 2nd, 3rd or 4th guess. The inner chainring was not really worn, and certainly not as bad as the outer.

    March 16, 2015 at 4:25 pm #835851
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    allanj

    Haggisbasher wrote:Okay we

    Haggisbasher wrote:
    Okay we have a solution.

    After changing the chain, twice. Wheels, three times. Cassette three times,then swapping for a new one. Replacing one dérailleur, and after all of that still slipping. I finally got the new chainring, fitted it and no more slipping.

    So those that guessed chainring, well done. For the rest, thanks once again for taking the time to reply.

    That wasn’t my guess, glad you got it fixed though

    March 16, 2015 at 10:46 am #835849
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    MKultra

    If that’s a short cage mech
    If that’s a short cage mech how big is that cassette?

    As you may have exceed the capacity of the mech explaining why you are not getting the largest sprocket.

    I would also TAKE IT TO THE BIKE SHOP.

    A good one.

    March 16, 2015 at 10:35 am #835847
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    Pub bike

    vorsprung wrote:you haven’t

    vorsprung wrote:
    you haven’t made it clear what you mean by the chain “slipping”

    He said “riding over” and that he “checked with three other wheels”, so not likely to be disengaging.

    vorsprung wrote:
    If it is “disengauging” then there is possibly a problem with the hub – although I’ve never seen anything like that

    Pawl springs can break (mine did on a Campag Vento wheel after 1,000 miles), and then there is a risk that the pawls will not engage immediately or at all, which can be annoying as you might end up stranded. It was very easy to fix though and the spring cost £1.

    March 15, 2015 at 7:38 am #835845
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    vorsprung

    you haven’t made it clear
    you haven’t made it clear what you mean by the chain “slipping”

    Two ways of explaining it are “jumping” – where the chain momentary or half changes to a different sprocket and “disengauging” when the chain and sprockets remain in firm contact but power is not transferred

    If it is “jumping” then there is something wrong with the way the derrailuers are set up
    If it is “disengauging” then there is possibly a problem with the hub – although I’ve never seen anything like that

    some of the words we use for bike transmission aren’t the best (like “chain stretch” for example) and “slipping” covers at least two different things

    March 15, 2015 at 1:23 am #835843
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    Haggisbasher

    Okay we have a solution.
    Okay we have a solution.

    After changing the chain, twice. Wheels, three times. Cassette three times,then swapping for a new one. Replacing one dérailleur, and after all of that still slipping. I finally got the new chainring, fitted it and no more slipping.

    So those that guessed chainring, well done. For the rest, thanks once again for taking the time to reply.

    March 14, 2015 at 12:52 am #835841
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    Anthony.C

    Funny, I was just going to
    Funny, I was just going to say the exact same thing as Stratman, it happened to me just yesterday and WD-40 fixed it for me too.

    March 13, 2015 at 11:11 pm #835839
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    Stratman

    I had something akin to this
    I had something akin to this on my defy. The dérailleur had got stiff and so wasn’t tensioning the chain properly. A bit of WD40 fixed it!

    March 13, 2015 at 4:43 pm #835837
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    fizrar6

    Same thing happened to me.
    Same thing happened to me. Sounds like your free wheel is worn and needs replaced. Check this first before you start meddling with the length of chain and sprockets etc. Is there axial movement in the wheel?

    March 13, 2015 at 9:22 am #835835
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    Pub bike

    Haggisbasher wrote:I have a

    Haggisbasher wrote:
    I have a day off tomorrow so I will strip it down, recheck chain length and derailliuer.

    Your original posting and subsequent comments suggest that everything works fine on all sprockets and the big chainring.

    You’ve said that the only time the skipping happens is when you use the inner chainring. So the problem could also be related to the inner chainring.

    There’s a discussion on [url=http://sheldonbrown.com/chains.html/]here[/url] under “Chain and Sprocket Wear” with some pictures of combinations of new/worn chain on new/worn sprockets that might help you decide whether your inner chainring is worn out or not by inspecting it with the chain on it.

    March 13, 2015 at 9:08 am #835833
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    ciderman_100

    looking at the view from the
    looking at the view from the back the derailleur looks canted from the picture from the side it shows damage if this damage occurred on that bike then there is a fair chance the hanger is bent with a worn chain and cassette no slipping but new chain new cassette slipping. so LBS for them to check the hanger is straight

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