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  1. #1
    Senior Member
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    SRAM Rival Der. to Cassette Compatibility

    I have a SRAM Rival 10 sp. derailleur and cassette. The cassette has a 28t cog on it(lots of hills in Seattle). I noticed on several sites that sell SRAM derailleurs that they only support up to a 27t cog. I had a problem recently that is in another thread where my derailleur got hung up in the wheel and cassette and bent my hanger. I thought, and still do, that it was caused by when my bike previously fell over.

    My question is....why would they sell a 28t cog on a cassette(Rival) when the matching derailleur(Rival) doesn't support it? Why does the box not mention it? Is there really that much of an issue? Could it have caused my problem?

  2. #2
    Senior Member
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    Aug 2005
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    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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    Most manufacturers have very conservative max tooth ratings for their rear derailleurs. Shimano states their road derailleurs have a 27T max but experience shows they will almost always work fine with a 30T cog and sometimes with a 32T. Unless SRAM is way different, a 28T cog should cause no problems.

    I expect your problem was indeed caused by the bike's fall, particularly if it landed on the drive side.

  3. #3
    Senior Member
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    Thanks. Yes, it did fall on the drive side.

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