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  1. #1
    mtbr member
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    May 2010
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    Sram X.O cage size Help

    I am buying parts for my first custom build bike and don't know the difference on small, medium or long cage size on Sram X.o rear deraileur. I am trying to replicate my 2006 stumpjumper pro, shifting has never needed tuned on it. It has an X.o rear, but how do I determine the size. Does it matter more on cassette. I am planning to us Sram PG990. Any help in simple language would be appreciate, I am fairly new to thinking about mechanics. Also, any recommendation on where to buy an X.O group. I mostly need drivetrain, not wheels, seat, seatpost, stem or bars. Thanks

  2. #2
    www.derbyrims.com
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    Jan 2004
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    6,788
    Quote Originally Posted by cibob113
    I am buying parts for my first custom build bike and don't know the difference on small, medium or long cage size on Sram X.o rear deraileur. I am trying to replicate my 2006 stumpjumper pro, shifting has never needed tuned on it. It has an X.o rear, but how do I determine the size. Does it matter more on cassette. I am planning to us Sram PG990. Any help in simple language would be appreciated, I am fairly new to thinking about mechanics. Also, any recommendation on where to buy an X.O group. I mostly need drivetrain, not wheels, seat, seatpost, stem or bars. Thanks
    Simply, 3 rings use long cage, 2 rings use medium, single ring us a small cage.

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