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New chain fitted but now have noise from cassette

Old 05-20-19, 06:26 AM
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GeoffBridgman
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New chain fitted but now have noise from cassette

I have just had a new chain fitted and iím getting a noise from the cassette. It sounds as if the new chain isnít seating itself into the cogs on the cassette at all times. This noise only occurs when going uphill, so more pressure on the pedals. It happens on all cogs in the cassette and only when under pressure. When cruising along there is no noise at all. Is this an adjustment issue or the wrong size chain? Please help.
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Old 05-20-19, 06:31 AM
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Why did you replace your chain?

Chains and cassettes tend to wear together. If you wait too long to replace your chain, your cassette cogs will have worn to match your old, worn chain. My guess is that's what's causing your noise.
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Old 05-20-19, 06:37 AM
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Originally Posted by Retro Grouch View Post
Why did you replace your chain?

Chains and cassettes tend to wear together. If you wait too long to replace your chain, your cassette cogs will have worn to match your old, worn chain. My guess is that's what's causing your noise.
Which means the OP might need a new cassette.
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Old 05-20-19, 06:54 AM
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OP: Do you have any idea how elongated the old chain was? Was it replaced by a LBS or mechanic? If so, did he/she say anything about replacing the cassette? The general rule using a 12 inch ruler is: 1/16 inch elongation - replace the chain; 1/8 inch elongation - replace chain and cogs. I don't use that rule automatically and will replace the chain first. Sometimes I've been lucky and the cassette was fine. I live in relatively flat country with some short hills. In my limited experience there are usually 1 or 2 cogs (the most used) on the cassette that are worn too far and therefore noisy. I think it a little unusual if all cogs are noisy. I would be sure that the rear derailleur is adjusted correctly before assuming the cassette needs replacement. If the chain was replaced by a LBS I'd take it back, describe the symptoms and ask them to check it out.
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Old 05-20-19, 09:39 AM
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If the chain is a different brand and model than the other chain, then slight differences in the shape of the side plates of the chain might be grabbing the next gear when the previous didn't. And even among chains made specifically for a particular number of gears there is still, I believe, some very small differences in width that could also cause the issue. Because of those things it might be that the rear derailleur just needs some minor adjustment.

So these as well as the other suggestions might be the reason. It could also be a number of other things too. So if a shop put it on for you, then take it back. They usually will stand by their work and make good anything they missed. Some things just don't show up on a test stand.
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