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  1. #1
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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?

  2. #2
    Elitist Troglodyte DMF's Avatar
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    Sounds like your RD needs a little adjusting.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  3. #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?

  4. #4
    Flying Under the Radar X-LinkedRider's Avatar
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    If it just sounds like the chain is subbing in some gears it is most likely just adjustments.
    12' SuperiorLite SL Pro w/ Sram Rival | 10' SuperiorLite SL Club w/ Sram Force | 06' Giant FCR (Dropbar) w/ Shimano 5700 | 10' GT Avalanche 3.0 Disc

  5. #5
    Senior Member Sci-Fi's Avatar
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    Sounds like minor RD adjustments, but when was the last time you replaced the chain?

  6. #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.

  7. #7
    Great State of Varmint Panthers007's Avatar
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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.
    How do you keep an idiot in suspense?

  8. #8
    Bikaholic blamp28's Avatar
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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.
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  9. #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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