Shimano BB-ES300 68 x 121mm Octalink Black Bicycle Bottom Bracket
- Splined bottom bracket for use with Shimano Octalink chainsets
- Oversize BB spindle - large 22mm diameter hollow
- Octalink splined axle/crank arm interface
- 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
- Manufactures part number: BB-ES300-K