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  1. #1
    mtbr member
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    Join Date
    Jan 2005
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    359

    BB spindle length question

    i need a 73 mm BB but i see there are many 73mm BB's with different spindle lengths. how does the spindle length come into play for what i need? i have a hollowtech xt crankset

  2. #2
    Ariolimax columbianus
    Reputation: nativeson's Avatar
    Join Date
    Apr 2005
    Posts
    1,062

    chainline

    Most frame manufacturers have a specific chainline they recommend for their frames. Most bikes use a 47.5mm - 50 mm chainline. Chainline is the distance from the middle of the bottom bracket shell to the middle chainring.

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