Shimano XTR BB93 English Bottom Bracket The latest version on the Shimano XTR Bottom Bracket shaves 19 grams from the previous model and offers lighter rotation and improved sealing. A smooth bottom bracket that will translate your input into power to the rear wheel is what every rider is after and the Shimano XTR BB93 delivers. Features: For 68mm to 73mm bottom bracket shells Threading: English Axle type 24mm Includes three 2.5mm spacers 89 Grams | Shimano XTR BB93 English Bottom Bracket BB93 English Bottom Bracket