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ask me how I know
How do you know? Have you measured a representative sample from both? I'd find it very surprising if the nominal 24mm bearing bore varied outside the usual tolerance range for industrial standard bearing cartridges
gbj_tester-
Every one I've had the pleasure of working with has been ever so slightly larger, they fit but it's always tighter than Shimano would be, not ideal when they try to remove the seal/spacer the Shimano BBs run on (I guess looser for hippy and his Shimano cranks in FSA BB, I've never tried that combo).
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I’ve taken a representative sample of them, well worked on quite a few and they have all been the same. I’ve tried to push the bearing on to the axle out of the frame and the NDS goes on ok, but the DS is ever so slightly bigger. I thought it was a well know as none of my colleagues were surprised.
snottyotter
Chaley
FSA cranks and BBs are ever so slightly bigger than Shimano, ask me how I know. You can normally get away with a threaded one, but press fit not so much.