Front crankset Shimano ULTEGRA FC-R8100 175MM 2x12-speed-52x36T

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