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  1. I believe it’s a 73mm bottom bracket and the crank spindle needs to be long enough to fit that. I’ve got a 920 that I reconverted to a 2x, and the GRX I tried had a spindle that was too short.

  2. It is 100% a 73mm bottom bracket shell so crank won’t work. Almost any mountain double will work.

    Shimano cranks use a 24mm spindle so you’d need a shimano bottom bracket (or compatible 24mm spindle bottom bracket)
    SRAM GXP is a 22/24mm spindle so 24 on one end and 22 on the other. Works with SRAM GXP compatible cranks.

  3. woodwarmsteelreal on

    Idk about the BB width but you need a hollowtech BB to go with that crank. The SRAM gxp won’t work. (+ They are crap anyway)

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