SHIMANO Ultegra R8100P Hollowtech II crankset with power meter

For Scientific Training You Need Accurate Measurements And Ease Of Use And The New Ultegra R8100 Power Meter Has Both. Measurement On Both Sides Is Accurate To Within 2.0% And Zero-Offset Calibration Is Quick And Easy. Perhaps Even More Important Is The Long Battery Life, Connection Options Via Ant+ And Bluetooth®Le, Making It Easier Than Ever To Record Your Workouts. Features: - Integrated, Waterproof And Rechargeable Li-Ion Battery - More Than 300 Hours Driving Time * Depends On Ant+/Bluetooth®Le Settings - ± 2.0% Accuracy In Voltage Measurement Throughout The Calibration Range - Patented Torque Meter - Ability To Start Quickly - Simple Zero Offset Calibration Via Switch On Transmitter - The Software Automatically Adjusts To Temperature Changes - Thanks To The New Force Vector Data, It Is The Optimal Training Tool To Analyze And Improve Pedal Stroke Efficiency Specification: - Crank Arm Length (Mm): 172.5 - Gear: 12s