Shimano BB-UN300 Square Taper Bottom Bracket - 68x118mm D4 race mount for the ultimate

race mount for the ultimate Tour de France level performance

Extended inner plate enhances chain retention

Efficient and ergonomic overlapping design optimized for high pressure applications

making the sunglasses ideal for use in a wide variety of riding conditions

long-lasting application of power to the drivetrain

Shimano BB-UN300 Square Taper Bottom Bracket - 68x118mm D4 race mount for the ultimateThe 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