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DURA-ACE proven 4-arm design: Same stiffness and lighter weight
Adjustable pad clearance for easy set up
Super narrow HG chain for 10-speed
Repair plugs and accessories are stowed inside the six machined compartments making this a convenient tool for riders with little or no storage space
Optimum performance and fit
Shimano BB-7710 Bottom Bracket 68 x 109.5mm Dura Ace Track Size:68X109.5 DURA-ACE proven 4-arm design: SameFeatures 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.