Shimano Dura Ace BB-7700 Bottom Bracket

Dura Ace bottom bracket with matching axle length for 2-speed chainrings. Available for BSA thread or Italian thread. Octalink axle profile!

Octalink Oversize bottom bracket axle

The large, hollow-rolled 22mm axle of the bottom bracket saves weight. The multi-tooth mount provides a tighter and more durable fit. Less axle bending due to composite bearing with balls and needles. Aluminum bottom bracket adapter

Suitable crankset e.g. Shimano Dura Ace 2x9 FC-7701.