- Optimum Power Transfer - Best Balance For Lighter Weight (-7G) And Efficiency - New Designed Crank Arm - Maintains High Rigidity And Reduces Weight - Hollowglide - 4-Arm Construction Crankset - Adapted For Race Specific Disc Brake System - Shorter Length Of Rear Center With O.L.D. 135mm - Redesign The Gear Teeth Profile To Fit Wider Gear Pitch - 50-34T/53-39T/54-42T/55-42T/52-36T - Iconic Design - Chain Line: 43.5
Shimano's R9100 series crankset achieves the ultimate in optimal power transfer. It does this through its broader Hollowtech II arm and a more reinforced outer chainring on its unique asymmetrical four-arm spider construction. The R9100 cranks set the highest standards for stiffness and lightness. With the first integrated power meter, you can expect extremely accurate data. The FC-R9100-P is Shimano’s first power meter, as well as Shimano’s first crank-integrated power meter on the market. It retains its unique asymmetrical four-arm spider construction, but with a ‘brain’ mounted on the inside. On its crank arm are the strain gauges. Working perfectly in sync with each other, you can use the extremely precise power data to improve your performance. - Accurate real time data - Compatible with 3rd party displays - Bluetooth / ANT technology - Hollowtech II construction - Hollowglide chain - 11-speed compatible - Waterproof in all conditions - ±2% accuracy of strain gage measured power - Integrated rechargeable battery - Simple zero reset with switch on transmitter - Average weight (170mm, w/o BB): 691 grams (53-39T)/679 grams (50-34T)
Campagnolo's Potenza offers the same race-winning shifting performance as its carbon fiber counterparts seen atop professional riders' bikes. Only slight changes in the material used in its construction differentiates Potenza. Its 4-arm spider features a unified bolt pattern to make changing between compact and standard gearing as easy as changing 8 bolts and two chainrings. This design incorporates an asymmetrically optimized bolt pattern with a spider arm that not only holds the chainring in place by way of the bolt, but also supports the chainring to increase system rigidity. And, the crank arms and spider are hollow for maximum stiffness with minimal weight. - Spindle/BB type: Campagnolo Power Torque - Spindle diameter: 25mm - Weight: 754g
Wheels Manufacturing 2.5mm Black Aluminum Bottom Bracket Spacers are for adjusting chainline or bearing play in English (BSA) or Italian threaded bottom brackets.
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