Shimano BB-ES25 Bottom Bracket. 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 & 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.