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  1. #1
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    Bottom Bracket 9,10 speed difference?

    I have a trek 1500 9 speed and I was thinking of changing the bottom bracket. Is there a difference between a 9 speed or 10 speed bottom bracket?

  2. #2
    Senior Member demoncyclist's Avatar
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    WHy do you want to change the BB? Is it shot?
    DEMON

    Satanic Mechanic
    STAR 3 Spinning Instructor

    2011 Lynskey Sportive (Shimano Ultegra 10s)
    1988 Cannondale SM400 (Suntour XC-M 7s)

  3. #3
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    no

  4. #4
    Senior Member
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    Quote Originally Posted by brianmr1 View Post
    I have a trek 1500 9 speed and I was thinking of changing the bottom bracket. Is there a difference between a 9 speed or 10 speed bottom bracket?
    Assuming the crank/bb are Shimano, the 9-speed is probably an Octalink and the 10-speeds would be a HollowTech II external-bearing type. They are completely different.

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