are MTB and road GXP bottom brackets interchangeable? Like, are they the same proportions...?
The plastic sleeve might be longer on the MTB one, but the cups are identical I think, worst case scenario you might need to stick some spacers on or get a longer sleeve depending which way round you are doing it.
The plastic sleeve might be longer on the MTB one, but the cups are identical I think, worst case scenario you might need to stick some spacers on or get a longer sleeve depending which way round you are doing it.