Splined bottom bracket for use with Shimano Octalink chainsetsOversize BB spindle - large 22 mm diameter hollow pipe billet spindle reduces weight, increases strength and rigidityOctalink splined axle/crankarm interface -results in more rigid crank assembly compared to square tapered spindleES51 has anti-corrosion treatment inside hollow spindleSealed cartridge assembly - maintenance-free sealed cartridge keeps out dirt, mud and waterCartridge design allows easy installation without adjustmentAluminium adapterAverage weight 262 grams
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