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Yeah, P2M's site mentioned something about them being normal q-factor compared to GRX.
Anyway, I've ordered a new Shimano BB and I'm going to stick my P2M gravel cranks on the Mason. Going from 34->30 means that I can stick on an 11-36T cassette for similar lowest gear to the 11-42T and slightly better jumps with a lighter and easier to pack wheel.
hippy
GRX is +2.5mm either side compared to road.