Shimano BB-7710 Bottom Bracket 68 x 109.5mm Dura Ace Track

Features Octalink

Compared the power transfer of OCTALINK with the conventional square taper spindle, the 8-splined OCTALINK interface that connects bottom bracket and crank set increases the strength and rigidity for entire assembly. SPECIFICATIONS Model No BB-7710 Series DURA-ACE TRACK 7710 Average Weight 244 g Remarks For track Compatibility Track Octalink splined system.