The Shimano ES300 bottom bracket is made to be used in conjunction with Shimano Octalink chainsets. The Octalink splined axle/crank arm interface creates a more rigid crank assembly compared to square tapered spindle.

Features
Smooth and precise shifting performance with Hyperdrive technology
Quiet shifting operation by reduction of driving noise (48T)
Chain case compatible
ALIVIO logo (T4060), SHIMANO logo (T4010)
Better sealing performance (SM-BB52)

Specifications
Axle length
Spindle: Hollow pipe
Spindle: Octalink

Mfr Claimed Weight
TBC