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  1. #1
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    Are Sram left arms the same?

    Hey guys,
    Left arm of my bb30 x9 crankset appears to be on its last leg. I have a gxp crankset in the garage. Before I remove the bolt on the BB30 set does anybody know the chances I will be able to but the gap left arm back on?

  2. #2
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    Only one way to find out.

  3. #3
    Drinkin' the 29er KoolAid
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    Quote Originally Posted by Heath27 View Post
    Hey guys,
    Left arm of my bb30 x9 crankset appears to be on its last leg. I have a gxp crankset in the garage. Before I remove the bolt on the BB30 set does anybody know the chances I will be able to but the gap left arm back on?
    Sorry, not going to work... BB30 uses a 30mm diameter spindle whereas GXP uses a 24/22mm spindle. Also the X9 BB30 crankset has the spindle permanently attached to the non-drive side crank arm whereas GXP has it attached to the drive side arm.

  4. #4
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    Yea I know the spindles are different sizing but if you look at the drive side attachment of the bb30 set it looks very similar to the gxp arm that is removed from the other

  5. #5
    Drinkin' the 29er KoolAid
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    Quote Originally Posted by Heath27 View Post
    Yea I know the spindles are different sizing but if you look at the drive side attachment of the bb30 set it looks very similar to the gxp arm that is removed from the other
    They do look similar, but looks are deceiving in this case.

  6. #6
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    Well glad I asked. When it finally goes I'll take it apart and see how it looks

  7. #7
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    I think they are the same arm forgings but they are machined differently to accommodate BB30 or GXP. It won't work. The spindle/arm interface is very different between the two.

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