Rotor Universal Bottom Brackets are designed to provide an easy yes to the question - is this bottom bracket compatible with my frame and crank? UBB PF4124 bottom brackets are designed to work with non-tapered 24mm spindled cranks and 41mm pressfit inner diameter bottom brackets. Rotor Universal Bottom Brackets are designed to provide an easy yes to the question - is this bottom bracket compatible with my frame and crank? UBB PF4124 bottom brackets are designed to work with non-tapered 24mm spindled cranks and 41mm pressfit inner diameter bottom brackets. Classic press fit bearing for all Rotor and other 24mm cranks Compatible with BB86 (Road) and BB 89/92 (MTB) Lathed, heat-treated hi grade steel cups Lip seals reduce rolling resistance
