The Ultegra FC-R8100 crank not only converts your pedal power into propulsion, with its high rigidity it also ensures extremely fast and precise gear shifting. The high gear shifting precision is supported by the optimized chainring design. To keep the weight low, the Japanese continue to use the tried and tested Hollowtech II construction of the crank arms. The crank is available with a gear ratio of 52-36 teeth and 50-34 teeth and with crank arm lengths of 160 to 175 millimeters. 


Technical data:
Area of ​​use: Road bike Crank
arm material: Aluminum
Spider material: Aluminum
Crankshaft material: Steel
Crankshaft diameter: 24 mm
Crank lengths: 160; 165; 170; 172.5 or 175 mm
Bolt circle diameter: 110 mm
Spider: 4-arm, asymmetrical
Chainring gradation: 50-34 or 52-36 teeth
Chainring screws: aluminum
Chain line: 44.5 mm
Q-factor: 148 mm
Bottom bracket compatibility: BSA, ITA, BB30, BB92 and others (optional, not included)
Chain compatibility: Shimano CN-M9100 12-speed, CN-M8100 12-speed