With reliable bearings and seals, the Shimano Ultegra SM-BB72-41 Bottom Bracket – Press-Fit - HOLLOWTECH II – 86.5 mm shell width bottom bracket has a long service life.
- Optimum power transfer
- Lightweight maintains efficiency
- DURA-ACE proven 4-arm design: Same stiffness and lighter weight
- 14 g lighter weight and half the friction of the SM-BB6700, while maintaining the same durability
- Variety choice of gearing: 53-39T/52-36T/50-34T/46-36T
- Weight: 69 g