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Slipping Chain

by SPAM Naval
Tue, Apr 17, 2012 11:59
7

Hi
Upgraded my chain at the weekend to a KMC 10 speed from a Mavic 10 speed that was at the end of its shelf life. Chain wear tool was showing it as in need of replacing (although it wasn't slipping/skipping at that point).
Problem I have now is the new chain is skipping/slipping when I put any power down. The 12-25 Ultegra cassette I'm using is only 5 months old so I was assuming I didn't need a new cassette as well (probably about 1500 miles max on daily commute and winter weekend rides in that time).
There may be an extra link length in the new chain that I didn't remove to match it to the old chain length exactly but I assumed that the derailleur (Ultegra long cage) would cope with that ok.
Any ideas?
Thanks

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7 comments

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SPAM Naval | 12 years ago
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thanks Roberj4, i'll check the jockey wheel clearance and stiff link later. Its my first KMC chain so we'll see how that goes. Mavic chain had worked out well and was really cheap (£11) but I think they have sadly been discontinued (no longer available on CRC anyway). SRAM chains I've never tried so maybe next time I'll take your advice and go for that

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Roberj4 | 12 years ago
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I'm in the belief you never need to replace sprockets if you take the time and trouble to keep this clean (weekly). I've been running the same 8/9/10 speed blocks for years with a change of chain once a year. Check to see if your upper jockey wheel isn't catching the sprocket in 1st gear. Check your sprocket lock ring is tight on to! Check to see if your new chain has a stiff link which may not be noticeable to the eye. This happened to me last week with a new Sram chain. Take hold of each link between thumb and finger push side to side backwards and forwards, complete this on each link problem resolved after this, never jumped this week. I've stuck with Sram chains (£20ish) for years having bought a KMC chain once which I replaced back to a Sram after 4 weeks use. Never ever buy Shimano chains unless it's Duraace (at a very good price if poss!!). My advice is from years spent in the cycle retail trade.

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SPAM Naval | 12 years ago
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thanks for the feedback. I've taken a punt and ordered a new cassette (happening on most cogs but generally the lower gears - 25, 23, 21..).
The chain set has done a lot of miles (Oct 2007 bike) so I'm hoping the cassette only will do the trick! 17

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big mick | 12 years ago
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homercles post is right.The worn chain will wreck a cassette really quick also chain rings are pretty soft alloy, chain hardened steel enough said! We are all guilty of not changing chains past there service life.If we replaced them every 4-6 weeks it would work out cheaper in the long term.Chain price£10-30 pound some cassettes more than £100.No brainer.Ive just talked my self into it.

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Psycling | 12 years ago
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Yep. Sounds like a worn cassette.

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homercles | 12 years ago
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Is it happening on all cassette cogs? I would check that as you might find that it only happens on certain cogs (most likely those you use most)- the age of the cassette is probably irrelevant if it's been used in conjunction with a worn chain. If that is the case of course it probably means a new cassette but at least you'll know it's properly adjusted otherwise.

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boardmanrider | 12 years ago
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I had a roughly similar problem last year: worn chain rings to blame. That was an expensive service, new chain, cassette, BB and then chainrings.

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