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ULTEGRA's FC-R8100 crank maintains the same quick, precise front shifting and efficient power transfer that Shimano riders have grown accustomed to, but with even more crank arm length options. An integral part of Shimano's 12-speed road lineup, the FC-R8100 crank builds upon Shimano's legendary front shifting and transmission efficiency.
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
For 2x12-speed drivetrains
Weight: 711 g (52-36T) / 700 g (50-34T)
Chainring combination (OPTIONAL): 50-34T OR 52-36T
Crank arm length: 175 mm
Compatible bottom bracket type: Outboard (Hollotech II)
Crank fixing screw included
Spider/Gear arms: 4
HOLLOWGLIDE
HOLLOWTECH II
HOLLOWTECH crank arm
Recommended bottom bracket (not included): Press-fit SM-BB72-41B or Threaded (normal) SM-BBR60
Threaded bottom bracket shell width: 68/70 mm
Q-factor: 148 mm
Chain line: 44.5 mm
B.C.D.: 110 mm
Material: crank arms, inner chainring: aluminium (anodized) / outer chainring: aluminium (anodized), carbon fiber reinforced polymer (CFRP) / axle: steel (plated)
Compatibility:
Front derailleur: FD-R9250, FD-R8150
Bottom bracket: SM-BBR60 (thread type), SM-BB72-41B (Press Fit)
Chain: CN-M9100, CN-M8100, CN-M7100, CN-M6100
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