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Old 03-09-09, 09:02 PM   #1
ljholland
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Noisey New SRAM Cassette?

I have a tri bike w/Ultegra from 2001. It had a 9 speed 11-23 Shimano cassette. Wanting a little more low end for a very hilly race I'll be doing, I bought a 9 speed SRAM 11-26 (AM PG 950) cassette as folks on this board said they'd be compatible.

So...after installing, yes it all works but it's rattly and noisey. The sound seems to be coming from where the chain leaves the cassette. It's also a little rougher shifting and jumps a bit.

The 11-23 Shimano was very quiet and smooth.

What gives?
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Old 03-10-09, 01:26 PM   #2
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Sounds like your RD needs a little adjusting.
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Old 03-10-09, 01:49 PM   #3
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A friend had another theory..... he thought that the SRAM cassette required a different chain.

(that's a bad implication as then I'd have to change other stuff too!)

Thoughts?
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Old 03-10-09, 01:54 PM   #4
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If it just sounds like the chain is subbing in some gears it is most likely just adjustments.
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Old 03-10-09, 02:35 PM   #5
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Sounds like minor RD adjustments, but when was the last time you replaced the chain?
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Old 03-10-09, 02:42 PM   #6
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The bike was used from Craigslist so I don't know the actual age. The chain seems in reasonable shape....but maybe the new cassette is proving otherwise.
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Old 03-10-09, 02:52 PM   #7
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Get a new chain - not a used one on a used bike. And then check the adjustment on the derailleur. When you get a new cassette (or freewheel), you often need a new chain also.
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Old 03-10-09, 03:58 PM   #8
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Quote:
Originally Posted by Panthers007 View Post
Get a new chain - not a used one on a used bike. And then check the adjustment on the derailleur. When you get a new cassette (or freewheel), you often need a new chain also.
+1

You might also check to see that the rear der can clear the 26 tooth.
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Old 03-10-09, 08:43 PM   #9
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So a visit to the LBS was helpful!

- Even though the Shimano chain should have been compatible with the SRAM cassette....it wasn't. A measurement of the chain found it was far from dead....but the mech suggested a chain as a test. He had an extra DuraAce chain lying around....it turned out that a new one fixed most of the issue.
- Derailleur cage was slightly bent causing some gears to chatter more than others.
- SRAM lock ring was slightly larger on the outer diameter than a Shimano... caused the chain to chatter on the 11 cog. Swap to Shimano ring fixed that.

Anyway....it's purring like a cat now.

Thanks!
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