Mechanics and Fixing Any Questions Answered

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snottyotter in reply to @hippy

Why would a spacer be required on a stock 73mm install

68mm + 2x2.5mm spacers = 73mm, the other 2.5mm spacer is to take the place of a BB mounted derailleur or chain guard, it's kinda obsolete now, but they've stuck with it. 3 spacers on 68 and 1 on 73.

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hippy in reply to @snottyotter

Ah, so the BB isn't 73mm? I thought because it was "MTB" BB as opposed to road it was already 73mm wide.

What should the BB measure externally when installed? 93mm?

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snottyotter in reply to @hippy

Ah, so the BB isn't 73mm

It's for 68 or 73 BB shell and is spaced out to take the longer axle on MTB cranks. Road/grav have a shorter axle so only 68 with no spacers.

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