Shimano BB-ES300 68x121mm Hollow-Type Bottom Bracket

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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.
• Axle length / shell width_121_68mm_(BC1.37) • Spindle: Hollow pipe • Spindle: Octalink 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) • Colour options: Black