Rotor Universal Bottom Brackets are designed to provide an easy yes to the question – is this bottom bracket compatible with my frame and crank? BSA30 UBBs are compatible with BSA threaded frames and BSA30 spindled Rotor cranks.FeaturesDesigned to work with BSA threaded bottom brackets and 30mm axle ROTOR cranksets Silicone seals offer low drag and quality-bearing protection Includes bottom bracket tool