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  1. #1
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    Ultegra shifter/cassette compatibility

    I recently bought a used road bike that has Ultegra 6510/9 speed shifters, a Shimano 105 front derailleur, Ultegra rear derailleur (jockey wheel cage plate is 4" in total length--medium cage?), standard FSA double crank. The cassette on this bike is a SRAM 11/34 9 speed. The bike shifts great except for the fact that it won't shift onto the biggest gear on the cassette. A mechanic told me that's to be expected since the Ultegra shifters are designed for maximum 27 or 28 tooth gear on the cassette. I would like to get a Shimano cassette in the 11/28 tooth range but most that I see on eBay are 10 speed. Will the setup that I currently have on this bike accept a 10 speed cassette or do I need to stick with 9 speed? I don't want to start changing out rear derailleurs, and the chain I have is practically brand new (SRAM 9 speed). Advice appreciated.

  2. #2
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    You should be able to find a 9-speed Ultegra cassette, 12-27. Search for CS-6500.

    To move to 10 speed, you'll need new shifters at least, and probably a new RD.

  3. #3
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    ok, and thanks for the response. appreciated.

  4. #4
    Senior Member rdtompki's Avatar
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    Quote Originally Posted by blurider View Post
    ...... A mechanic told me that's to be expected since the Ultegra shifters are designed for maximum 27 or 28 tooth gear on the cassette.......
    This makes absolutely no sense. The medium cage RD probably won't handle the 34t. Either find a 9 speed Shimano or SRAM cassette with a 28t max. cog or change the RD. It will cost you a lot from money to go 10 speed for very little gain.
    Rick T
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  5. #5
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    Quote Originally Posted by rdtompki View Post
    This makes absolutely no sense. The medium cage RD probably won't handle the 34t. Either find a 9 speed Shimano or SRAM cassette with a 28t max. cog or change the RD. It will cost you a lot from money to go 10 speed for very little gain.
    I'll bet OP either misunderstood or mis-used "shifter" when, like you say, it's the derailleur's fault.

    OP: for $25 - $50, you can buy a Shimano Deore mountain bike rear derailleur that will work with the cassette you have and the shifters you have. Just make sure the rear derailleur is either 8 speed or 9 speed, not the 10 speed versions.

    Or like rdtompki suggested, get a 9 speed Sram or Shimano cassette with a large sprocket somewhere between 26 and 28 teeth. I'll bet your rear derailleur is "rated" for a maximum of 26 or 27 teeth, but 28 and sometimes even 30 have been known to work. I have a 28t cassette on mine and it works fine.

  6. #6
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    It will cost you a lot from money to go 10 speed for very little gain.

  7. #7
    Senior Member seymour1910's Avatar
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    OP, I have almost the same setup on my bike and I use this cassette, not very expensive, and works vey well.

    http://www.ebay.com/itm/Sram-PG-950-...item43bdccf4c3

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