Shimano Dura-Ace
BB-7700 Octalink Bottom Bracket

The Shimano Dura-Ace BB-7700 is an Octalink bottom bracket with 8-speed gearing that has been used for decades. It fits perfectly with the Dura-Ace Track crank FC-7710. Its cold-forged hollow axle increases stiffness.

Specifications:

Application: Track, Road
Series: Dura-Ace 7700
Type: BSA, ITA
Shell Width: 68 mm, 70 mm
Axle Length: 109.5 mm
Axle Type: Octalink (Road)
E-Type Compatibility: no
Chaincase Compatibility: no