Fairly simple crank install question...- Mtbr.com
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  1. #1
    DSR
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    Fairly simple crank install question...

    This is regarding the install of a splined XTR crankset onto a splined XTR BB, but basically applies to all splined systems. How can I be sure that I have the cranks properly installed on the spline? You can line 'em up, but can't see in there once you start tightening. I'm gun shy since once I didn't get them properly seated which I found out the first time I really cranked on them and the arm moved. Should it be pretty obvious, like if they're not lined up correctly then the crank threads will appear to "bottom out" after just a couple turns? Thanks for any help. S

  2. #2
    Derailleurless
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    Never thought much about it because mine have always gone on so easily (obviously?), but it would seem that either you're not seated (grooves lined up with grooves) and the crank arm would be able to spin around the spindle, or else you're "in the groove" (even if just barely) to where the arm won't spin without taking the spindle with it.

    I can't imagine there is any sort of "inbetween state" in which the splines are only partially engaged.

  3. #3
    jrm
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    Chainline....

    Quote Originally Posted by DSR
    This is regarding the install of a splined XTR crankset onto a splined XTR BB, but basically applies to all splined systems. How can I be sure that I have the cranks properly installed on the spline? You can line 'em up, but can't see in there once you start tightening. I'm gun shy since once I didn't get them properly seated which I found out the first time I really cranked on them and the arm moved. Should it be pretty obvious, like if they're not lined up correctly then the crank threads will appear to "bottom out" after just a couple turns? Thanks for any help. S
    Your manual will show in a diagram what the distance from the seatpost tube to the outside of the outter ring should be in cm's. This tells you if and when the crankset is on the BB far enough.

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