The RaceFace PFBB30 X-Type Adapter allows use of all Race Face, Shimano and select FSA 24mm spindles RaceFace PFBB30 X-Type Adapter Features MTN cranksets in PF30 BB Shell Frames. Press-fit bearing cups works like an external type headset. Positions the bearings externally with exactly the same wide spacing as threaded external mountain BB's. Precision CNC machined and anodized aluminum alloy cups: More accurate, durable and stable press-fit interfaces than the competitors' molded plastic parts. Serviceable bearing design. Built for: XC/AM/FR/DH Weight: 130 grams