Shimano Ultegra FC-R8100

The ULTEGRA FC-R8100 crank performs two vital functions: transferring your pedaling effort into the drivetrain and ensuring the fastest, most precise front shifting available. Thanks to HOLLOWTECH II and HOLLOWGLIDE technologies, Shimano's class-leading chainring designs, the FC-R9200 strikes the optimal balance of stiffness, strength, weight and rotational performance. 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 Available chainring options: 52-36, and 50-34T, and crank lengths: 165, 170, 172.5, and 175mm HOLLOWTECH II Technology BB set not included Attributes BCD 110 BB Inclusion No Chainline 43.5mm Crank Spindle Diameter 24mm Interface Hollowtech II Crankset Material Aluminum Pedals Thread 9/16'' Primary Color Black Speed 12 Drivetrain Spacing Road Disc