This Shimano BB-ES300 bottom bracket is a direct replacement for the ES25 and designed to be used with Shimano Octalink chainsets. Octalink splined axle/crank arm interface results in more rigid crank assembly compared to square tapered spindle.
- Splined bottom bracket for use with Shimano Octalink chainsets
- Oversize BB spindle - large 22 mm diameter hollow cold forged chrome-moly pipe billet spindle reduces weight, increases strength and rigidity
- Octalink splined axle/crank arm interface - results in more rigid crank assembly compared to square tapered spindle
- Sealed cartridge assembly with oversize ball bearings - maintenance-free high efficiency rubber seals keep out dirt, mud, and water
- Cartridge design allows easy installation without adjustment
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