Shimano BB-UN300 Square Taper Bottom Bracket - 68x118mm D4 Extended inner plate enhances chain

Extended inner plate enhances chain retention

long-lasting application of power to the drivetrain

Fork designed to improve maximum chain crossover

Efficient and ergonomic overlapping design optimized for high pressure applications

Optimized 7000-series forged aluminum arms support the X-SYNC 2 chainring for complete chain control

Shimano BB-UN300 Square Taper Bottom Bracket - 68x118mm D4 Extended inner plate enhances chainThe quality and performance oriented Shimano BB UN300 cartridge bearing bottom bracket features a JIS square taper mount and is designed for frames with BSA thread and 68 mm shell width. A stabilizer ensures a constant chain line. Specifications Adapter: aluminum (left), aluminum steel (right) Axle: steel Mfr Claimed Weight TBC