Bottom bracket “standards”

Bottom bracket “standards”


Bottom Bracket ‘standards’:
which BB is which and does
it actually matter..?

The current state of the road bike bottom bracket
maker’s art is one of complex interaction and plenty
of choice. Essentially, there are two axle diameters:
24mm (usually steel), 30mm (almost always aluminium);
three bottom bracket shell internal diameters: threaded
(two of these if we are picky), 42mm, 46mm; and four
main “widths”: 68mm, 79mm, 86.5mm, 90mm…
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