You need a bottom bracket that fits a bb30 frame but has space for a 22 mm axle for GXP. Wheels Manufacturing definitely do one, but there are others.
22 mm axle for GXP
24mm axle with a 22mm ID bearing on the NDS.
@snottyotter started
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You need a bottom bracket that fits a bb30 frame but has space for a 22 mm axle for GXP. Wheels Manufacturing definitely do one, but there are others.