Shimano BB-ES300 BSA 68mm Bottom BracketComparing the power transfer of OCTALINK to the conventional square taper spindle, the 8-spline OCTALINK interface connecting the bottom bracket and crankset increases the strength and stiffness of the entire assembly. Features Shimano BB-ES300 BSA 68mm Bottom Bracket

• Stiff and light for efficient power transfer.
• Reinforced and durable groove construction.
• The 8-slot OCTALINK interface increases the strength and rigidity of the entire assembly.
• 26g lighter than BB-ES25.
• Fast and precise assembly.
• Good chainline control with stabilizer