Bottom bracket Shimano ES300 BSA 68 - 121 mm Octalink

Bottom bracket components shimano acera es-300 octalink. Large oversized bb spindle 22mm diameter hollow cold-forged chrome-moly tubing to reduce weight, billet spindle increases strength and rigidity octalink splined axle/crank arm interface - results in stiffer crank compared to tapered spindle squares sealed cartridge assembled with oversized ball bearings
Maintenance-free high-efficiency rubber seals protect from dirt, mud, and water cartridge design allows easy installation without adjustment.