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This Shimano ES25 Octalink Bottom Bracket is a sealed cartridge with oversized ball bearings that uses Shimano's oversized Octalink spindle design. It's large 22mm diameter hollow cold forged chrome-moly pipe billet spindle reduces weight and increases strength and rigidity. With the increased surface area of the spindle, givers the interface between the crank arm and the axle a better more rigid fit then a square taped spindle. Being a sealed system the dirt, mud and water is kept at bay using rubber seals that keep it maintenance free.
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