Shimano BB-ES25 70mm Shell Octalink Bottom Bracket - Italian Thread

- Splined bottom bracket for use with Shimano Octalink chainsets.
- Oversize BB spindle - large 22mm diameter hollow cold forged chrome-moly pipe billet spindle reduces weight, increases strength & 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 & water.
- Cartridge design allows easy installation without adjustment.