Shimano BB-7700 Dura-Ace bottom bracket 68 - 109 mm

Precision engineered Dura-Ace 7700 bottom bracket for road Octalink splined system
22 mm diameter chrome-moly hollow pipe billet axle reduces weight
Splined interface provides a more rigid crank assembly compared to tapered counterparts
Compound bearing structure - ball and needle bearings support the spindle to reduce flex
Maintenance-free sealed cartridge design prevents corrosion and is easy to install
Average weight 173 g