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70 x 113mm
68 x 121mm
70 x 118mm
68 x 113mm
68 x 118mm
73 x 113mm
73 x 118mm
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Shimano ES51 Octalink Bottom Bracket

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

A 2 year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).

Buy Shimano Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.

  • Colour: Silver
  • Size: 70 x 113mm, 68 x 121mm, 70 x 118mm, 68 x 113mm, 68 x 118mm, 73 x 113mm, 73 x 118mm
  • Option: Italian Thread, English Thread