SHIMANO ES51 OCTALINK bottom bracket 68/73 - 121 mm
FITS 68 AND 73 FRAME
Splined Bottom bracket for use with Shimano Octalink chainsets
Oversize BB spindle - large 22 mm diameter hollow pipe billet spindle reduces weight, increases strength and rigidity
Octalink splined axle/crankarm interface -results in more rigid crank assembly compared to square tapered spindle
ES51 has anti-corrosion treatment inside hollow spindle
Sealed cartridge assembly - maintenance-free sealed cartridge keeps out dirt, mud and water
Cartridge design allows easy installation without adjustment
Aluminium adapter
Average weight 262 grams
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