An integral part of Shimano's new 12-speed road lineup, the FC-R8100 crank builds upon Shimano's legendary front shifting and transmission efficiency. With new refinements for seamless 12-speed shifting, the ULTEGRA crank is now offered in lengths from 160 to 175 mm, bringing performance and improved fit for smaller riders, triathletes, and riders with specific biomechanical requirements.


FEATURES

Optimal balance of stiffness, strength, weight and rotational performance
HOLLOWGLIDE structure cuts weight yet maintains strength for better power transfer and quicker, more precise front shifting


SPECIFICATIONS

Series: ULTEGRA
Rear speeds: 12
Compatible chain: HG 12-speed
Chain line (mm): 44.5
P.C.D. (mm): 110
Spider/gear arms: 4
Chainring combination: 50-34T
Q-factor (mm): 148
Crank arm length (mm): 160, 165, 170, 172.5, 175

Optional chain guard without chain/bash guard
HOLLOWTECH II
HOLLOWTECH crank arm
HOLLOWGLIDE
Compatible bottom bracket type: Outboard
Recommended bottom bracket: Threaded (normal) - SM-BBR60; Press-Fit - SM-BB72-41B
Threaded bottom bracket shell width (mm): 68, 70
Crank fixing screw included