I thought you could use Hollowtech BBs with GXP?
What I must be thinking of is the On-One outboard bearing track chainset, which came with a rubbish BB but was compatible with Hollowtech.
Could you be thinking about the FSA chainset which are also 24mm?
Exactly that. I was getting the setup on my bikes confused, the Genesis (still for sale!) has FSA cranks and an Ultegra BB.
@edscoble started
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I thought you could use Hollowtech BBs with GXP?
What I must be thinking of is the On-One outboard bearing track chainset, which came with a rubbish BB but was compatible with Hollowtech.