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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.
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
52-36, 50-34, and 46-36 chainring options. 160, 165, 170, 172.5, and 175 mm crank arm lengths.
Providing the best balance of stiffness, strength, weight and rotating performance
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: 46-36T, 50-34T, 52-36T
Q-factor (mm): 148
Crank arm length (mm) - Crank arm length (mm) - 160: ✔
Crank arm length (mm) - 165: ✔
Crank arm length (mm) - 170: ✔
Crank arm length (mm) - 172.5: ✔
Crank arm length (mm) - 175: ✔
Optional chain guard - Without chain/bash guard: ✔
HOLLOWTECH II: ✔
HOLLOWTECH crank arm: ✔
HOLLOWGLIDE: ✔
Compatible bottom bracket type - Outboard: ✔
Recommended bottom bracket - Recommended bottom bracket - Threaded (normal): SM-BBR60
Recommended bottom bracket - Press-Fit: SM-BB72-41B
Threaded bottom bracket shell width (mm) - 68: ✔
Threaded bottom bracket shell width (mm) - 70: ✔
Crank fixing screw included: ✔
Average weight: 702 (46-36T) 700 (50-34T) 711 (52-36T)
