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  1. #1
    Senior Member
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    Mixing crank brands

    I have a bad left side crank arm and can't find an exact replacement. I currently have a FSA ISIS Alpha Drive crankset, but can only find a Truvativ ISIS left crank arm replacement. They are the same lengths, will this be ok?

    My other option is to upgrade to better crankset/bb, but I'm in a bit of a rush with a big mtb trip rapidly approaching and I'm afraid I won't have time to install an entirely new crankset/bb in time.

    The left crank arm replacement seems like the quickest fix.

    All help is greatly appreciated.

    Thanks.

  2. #2
    Senior Member
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    This is done all the time, many shops keep a few "generic" crank arms on hand just for this reason. Not always pretty but it's cheap quick and functional.

  3. #3
    coprolite fietsbob's Avatar
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    I currently have a FSA ISIS Alpha Drive crankset, but can only find a Truvativ ISIS left crank arm replacement. They are the same lengths, will this be ok?
    ISIS is the commonality, you need another ISIS spline crank arm.

    take the old one off, and compare, offset should be similar, [to clear chainstay]
    length is a distance between holes number to match.

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