The ULTEGRA FC-R8100 crank serves as a crucial component of Shimano's advanced 12-speed road lineup. Engineered for superior front shifting efficiency, this crank features a HOLLOWGLIDE construction that successfully balances lightweight performance with strength. Available in multiple crank arm lengths from 160 to 175 mm, it caters to a wide range of cyclists, including smaller riders and triathletes. A selection of chainring combinations ensures optimal power transfer and enhanced cycling experience.
From the brand: 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.
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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
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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)
