Chain slipping at rear.. chook,chook,chook!

by kayakboyuk   February 22, 2012  

Hey roadies hope you can help with a mechanical mystery:
I've had a Jamis Xenith since Sept 09 and used it to commute and train around Manchester for 2 years covering about 2000 miles.
A gear cable snapped in August which I had this replaced at a shop but they warned me of a worn drive train. Within 6 weeks the chain began to slip in higher gears when pushing off at lights. I saw this as an opportunity to get a new larger crank set to improve top speeds. The previous set was a compact set and had worn down the larger ring to 'waves' I purchased a near new crank FSA set with 53T from ebay. This did not solve the slipping.
I read a few forums and fitted a new chain, a new rear mech (which had worn and chipped jockey wheels)and hanger (which was bent in a crash on some ice.)
The only thing I have not upgraded recently is the rear cassette which does not appear to be excessively worn and has had wear spread across several gears anyway.

The slipping still occurs in any of the smallest 4 rings on the rear; 11-14T. I am currently unable to use the bike to train as any agressive acceleration causes the chain to slip/jump. It makes a noise like chook chook chook when trying to push in high gear.

Any ideas as I don't like getting passed.

Graeme

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5 user comments

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Cassette worn out replace it!

posted by TheDoctor [109 posts]
22nd February 2012 - 17:42

1 Like

As suggested above.

posted by scaramanga [34 posts]
22nd February 2012 - 17:48

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Think you'd already answered your own question... Smile

andylul's picture

posted by andylul [417 posts]
22nd February 2012 - 17:49

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gearing generally wears together(buy a chainchecker) the fault being the chain stretches and the cassete and rings wear together(i change my chain every 4 months) if you keep on top of the chain your rings and cassette will intheory not wear out as quickly, but 2000 miles and a new chainset and chain with an old cassette is not going to happen, hopefully you havent done any damage by running the new/new/old but change the cassete and you will be back to slick secure changes, and the chain checker thing, they can be bought for about 8-9 quid, if the chain starts wearing change it, £15 on a chain is far cheaper than £15 chain/£50/60 rings/ £30 on a cassette. Smile

posted by russyparkin [578 posts]
22nd February 2012 - 21:55

1 Like

also sounds stupid but make sure if your running 9 speed you have fitted a 9 speed chain etc etc, if you put an 8 speed on a 9 speed cassette it wont work etc

posted by russyparkin [578 posts]
22nd February 2012 - 21:56

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