Race face press fit 30 x type bb adaptertheraceface press fit 30 x type bb adapterconverts your pfbb30 mountain bike frame to work with the worlds best cranks with no weight penalty to traditional thread in bb cups featuresallows use of all race face shimano and select fsa 24mm spindle 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 bbs prec