Octalink splined axle/crank arm interface - results in a more rigid crank assembly compared to square tapered spindle. 118mm Axle. Campagnolo Power Torque CX Sealed Bottom Bracket Bearings - FC-CX012.
Shimano BB-ES300 Octalink Bottom Bracket - 68mm
Shimano BB-ES300 Octalink BSA Bottom Bracket Various Sizes
Shimano BB-ES300 Octalink Bottom Bracket - All Sizes 68 & 73mm
Shimano BB-ES300 Octalink Bottom Bracket - 68 x 121mm
Shimano Deore Alivio Octalink V2 Bottom Bracket ES-300 73 x 126
Shimano BB-ES25 Octalink Sealed Cartridge Bottom Bracket - English Thread