SHIMANO DURA-ACE - Bottom Bracket - Threaded - HOLLOWTECH II - 68/70 mm shell width With an advanced seal construction for smoother rotation and small ball bearings to minimize weight, the SHIMANO DURA-ACE bottom bracket is offered in both pressfit and threaded options. Bottom bracket with small ball bearings for lightweight. Advanced seal construction for smoother rotation.
SPECIFICATIONS:
| Model No. | BB-R9100 |
| Series | DURA-ACE R9100 Series |
| Weight | 65g |
| Hollowtech II Bottom Bracket | Yes |