Shimano Octalink Bottom Brackets

Shimano use the Octalink spline system on their mid-range cranks and bottom brackets. It is being replaced on the dearer cranksets with the Hollowtech II system (outboard bearing).

Shimano BB-ES25 68 x 113mm

Shimano BB-ES300 Octalink 68 x 118mm

Shimano BB-ES300 Octalink 68 x 126mm

Shimano BB-ES300 Octalink 68 x 121mm