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  1. #1
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    Apr 2011
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    BB86 on Anthem X 29er frame

    I want to use a Shimano XT external BB crankset. Do I need a Shimano BB86 bottom bracket? Isn't BB86 typically for road, so wouldn't the BB86 be too narrow for MTB cranks? Do I the use spacers that come with the XT crank to resolve this, although I don't use the XT bottom bracket? Thanks!

  2. #2
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    Quote Originally Posted by tosa View Post
    I want to use a Shimano XT external BB crankset. Do I need a Shimano BB86 bottom bracket? Isn't BB86 typically for road, so wouldn't the BB86 be too narrow for MTB cranks? Do I the use spacers that come with the XT crank to resolve this, although I don't use the XT bottom bracket? Thanks!

    You need a BB92. Shimano makes their own. You may need to use 1 spacer on the drive side. I had to with my XTR 985 crankset.

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