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This is a normal post I have only replaced/built with Hollowtech II BBs
and they went fine... thankfully no spacers to consider.

My fixie is the junker - square BB, but there are about 6 depth variants. Bleh.
(, Sat 12 Aug 2017, 23:50, Reply)
This is a normal post Size required is dictated by a: bb shell width and b: chainset used, since they can sit on the spindle differently depending on the design.
So for example an FC-2450 chainset like what's on my winter bike, mounted on a cartridge BB with a spindle of 113 would locate the midpoint between the chainrings at 43.5 which is the recommended Shimano road double measurement.
(, Sun 13 Aug 2017, 1:03, Reply)