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  • Hollowtech 2 cranks: do road and MTB cranks have different length spindles? By the same token, do hollowtech 2 bottom brackets from road groupsets have a shorter plastic sleeve on them (than MTB BBs) so that they'll fit a 68mm wide BB shell without any spacers between the shell and cups?

  • MTB are 73 (or 83 for downhill), 68 for road double.

    Not too sure about the sleeve but the right side cup of a MTB 68/73 BB has a wider threaded section.

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