Chain slipping

blightyinfurs · Oct 7, 2012

Trying to remedy chain slippage on a new build. It feels as if it's coming from the back, but I could be wrong. I was advised to take any excess chain length off, but it's made no difference. It's a 9-speed, running on a 7 speed block... No gold in seven. After looking at Sheldon Brown, I thought it'd work, but I'm beginning to think again.

Anything else I should try before replacing the chain?

Tel · Oct 7, 2012

Sounds like either the chain or cassette is worn. Have you a tool to check the. Chain (alternatively it can be measured), do you have a different cassette to try?

blightyinfurs · Oct 7, 2012

Thanks Tel - Tried to put a different wheel on last night, but being a 23c the clearances were too tight. The chain was brand new, and the Marchisio freewheel looks like it's got less than 1000 miles on it.

Tried a different derailleur.

I'm cleaning up some old sprints at the minute, I'll try that once it's roadworthy.

Tel · Oct 7, 2012

It's likely to be the cassette. I've had plenty that look great but if they were used with a worn out chain they tend to wear the cassette down very quickly making it useless with a good chain. Check and replace your chain regularly folks.

Is it only on certain sprockets that it slips?

blightyinfurs · Oct 7, 2012

Yep, on the top two gears, (smaller cogs)

Midlife · Oct 7, 2012

Typical of a mismatched chain / bock

The small cogs have so little wrap around the chain rides up.

Can be improved slightly by going for a slant pantograph type rear mech but usual solution is a new block.

Shaun

Chain slipping

blightyinfurs

Old School Hero

Tel

blightyinfurs

Old School Hero

Tel

blightyinfurs

Old School Hero

Midlife

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