This is the crank fitting through the drive-side of the new GXP BB but not fitting through the NDS BB bearing (removed in this photo, as I was trying to fit it over the end of the axle)
There's no visible step down on the axle, then? And it's definitely a truvative / GXP crank? Weird.
No idea what the crank is. It has an FSA spider lockring and M175 markings, that's about it.
@Howard started
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This is the crank fitting through the drive-side of the new GXP BB but not fitting through the NDS BB bearing (removed in this photo, as I was trying to fit it over the end of the axle)