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 Post subject: Chain slipping
PostPosted: Sun Oct 07, 2012 12:09 am 
Old School Hero

Joined: Wed Aug 19, 2009 11:55 pm
Posts: 157
Location: Derby
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?


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 Post subject:
PostPosted: Sun Oct 07, 2012 9:19 am 
Road Moderator
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Joined: Thu Jun 18, 2009 1:07 pm
Posts: 4715
Location: Sheppey, Kent
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?


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 Post subject:
PostPosted: Sun Oct 07, 2012 10:27 am 
Old School Hero

Joined: Wed Aug 19, 2009 11:55 pm
Posts: 157
Location: Derby
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.


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 Post subject:
PostPosted: Sun Oct 07, 2012 12:18 pm 
Road Moderator
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Joined: Thu Jun 18, 2009 1:07 pm
Posts: 4715
Location: Sheppey, Kent
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?


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 Post subject:
PostPosted: Sun Oct 07, 2012 3:00 pm 
Old School Hero

Joined: Wed Aug 19, 2009 11:55 pm
Posts: 157
Location: Derby
Yep, on the top two gears, (smaller cogs)


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 Post subject:
PostPosted: Sun Oct 07, 2012 3:09 pm 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
Posts: 8245
Location: Cumbria
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


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