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gbj_tester
Tester has nailed it, the Rotor 4130 bearing will fit in your frame, but the cranks will only work if the axle is longer than 91mm (hence the name bb91)
Standard GXP cranks will work with a SRAM bearing or a set of Rotor cranks will work perfect as they're 91mm axle length - look at the Rotor Power or P2M