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New chain / gears skipping = worn cassette?

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New chain / gears skipping = worn cassette?

Old 06-10-10, 01:12 PM
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New chain / gears skipping = worn cassette?

Just put a new SRAM chain on my commuter bike, which has a 9-speed 11-34 Shimano cassette in the rear. Had a terrible commute to work -- chain won't stay in the 3 largest cogs without skipping around.

I believe this means I need a new cassette -- the existing one has about 4,500 to 5,000 miles, a lot in the winter grit. Any reason not to get a new one -- I have a hard time judging "tooth" wear on the cogs.

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Old 06-10-10, 01:13 PM
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Probably.

And do it soon. Too much riding on a worn cog will ruin your new chain.
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Old 06-10-10, 01:41 PM
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Originally Posted by caloso
Probably.
I agree that's the most likely answer. Before spending the money, however, I'd want to check the derailleur adjustment and hanger alignment.
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Old 06-10-10, 09:17 PM
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Also, if you still have your old chain, measure to see if it's "stretched".
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Old 06-10-10, 09:30 PM
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Thanks for the input.

Just to close the loop -- first, I did measure the chain. It was stretched, which was why I replaced it. Second, I discovered (to my embarrassment) that the really serious problem I was having was caused by the fact that I had improperly remounted the rear wheel -- the QR skewer was not tight enough, and the wheel was slipping under load. That's what was causing the slippage in the larger cogs.

Finally, I do think this cassette is worn, though -- I'm going to replace it.
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