shimano bb-es300 68 - 113 mm bottom bracket

Splined bottom bracket for use with Shimano octalink chainsets.Features:Oversize bb spindle - large 22 mm diameter hollow cold forged chrome-moly pipe billet spindle reduces weight, increases strength and rigidityOctalink splined axle/crank arm interface - results in more rigid crank assembly compared to square tapered spindleSealed cartridge assembly with oversize ball bearings - maintenance-free high efficiency rubber seals keep out dirt, mud and waterCartridge design allows easy installation without adjustment