Shimano BB-UN300 Square Taper Bottom Bracket - 68x123mm Attaquer The PC-1031 chain benefits from

The PC-1031 chain benefits from design for better performance

Its single LED design provides an impressive maximum output of 500 lumens and eight output modes

And with small parts included for both road and mountain systems

not the rest of the system

Shimano BB-UN300 Square Taper Bottom Bracket - 68x123mm Attaquer The PC-1031 chain benefits fromThe 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