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ULTEGRA's new FC-R8100 crank maintains thesame quick, precise front shifting and efficient power transfer that Shimanoriders have grown accustomed to, but with even more crank arm length options.Spanning 160 to 175 mm in length, ULTEGRA cranks now cater to smaller riders,triathletes, and cyclists curious about shorter crank arms.
An integral part of Shimano's new 12-speedroad lineup, the FC-R8100 crank builds upon Shimano's legendary front shiftingand transmission efficiency. With new refinements for seamless 12-speedshifting, the ULTEGRA crank is now offered in lengths from 160 to 175 mm,bringing performance and improved fit for smaller riders, triathletes, and riderswith specific biomechanical requirements.
FEATURES:
Optimal balance of stiffness, strength,weight and rotational performance
HOLLOWGLIDE structure cuts weight yetmaintains strength for better power transfer and quicker, more precise frontshifting
52-36 and 50-34 chainring options. 160,165, 170, 172.5, and 175 mm crank arm lengths.
SPECIFICATIONS:
MODEL NO FC-R8100
SERIES ULTEGRAR8100 Series
Average weight 711 (52-36T) 700 (50-34T)
Threaded bottom bracket shell width (mm)_70 ✔
Chainring combination 52-36T 50-34T
Compatible bottom bracket type_Outboard ✔
Crank fixing screw included ✔
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 ✔
Spider/Gear arms 4
HOLLOWGLIDE ✔
HOLLOWTECH II ✔
HOLLOWTECH crank arm ✔
Optional chain guard_Without chain/bashguard ✔
Recommended bottom bracket_Press-fit SM-BB72-41B
Recommended bottom bracket_Threaded(normal) SM-BBR60
Threaded bottom bracket shell width (mm)_68 ✔
Q-factor (mm) 148
Chain line (mm) 44.5
Compatible chain CN-M8100
P.C.D. (mm) 110
Rear speeds 12