Shimano Dura Ace BB-R9100 Bottom Bracket 68mm English Thread

- Complete Dura Ace R9100 threaded bottom bracket assembly for Shimano HollowTech II Road cranks - BSA English (1.37" x 24 tpi) threaded cups with outboard bearings - Set includes left and right hand cups and inner cover - New improved sealing ensures 50% less drag - 33.7mm cup diameter - Compatible with 68mm shells