Shimano Dura Ace 7710 NJS Octalink bottom bracket
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This NJS approved & certified bottom bracket is specifically designed for use with Dura Ace 7710 track crank arms.
• 68mm English threaded (1.370" x 24 tpi)
• spindle: 109.5mm Octalink
• sealed cartridge bearings
• NJS approved
• crank arm bolts & dust caps sold separately
• requires Park Tool BBT-22 & any track lockring tool for installation & removal
• weight: 230g