Shimano Es25 Octalink Bottom Bracket

This is a splined Octalink bottom bracket that is designed for use with Shimano Octalink chainsets.
It has an oversize 22 mm diameter, hollow cold forged, chrome-moly, pipe billet spindle, that reduces weight, yet increases strength and rigidity.
It also has a sealed cartridge assembly, with oversize ball bearings and maintenance-free high efficiency rubber seals that keep out dirt, mud, and water.
The cartridge design also allows for easy installation, without adjustment.