Short Description
The Shimano Ultegra FC-R8100-P Power Meter Chainset combines precise dual-sided power measurement with the lightweight, stiff and efficient performance of Shimano’s Ultegra 12-speed road groupset. Offering accurate training data, wireless connectivity and a rechargeable integrated battery, it is an ideal upgrade for performance-focused road cyclists.
Key Features
- Dual-Sided Power Measurement: Measures power independently through both crank arms for detailed and reliable performance data
- ±2% Measurement Accuracy: Integrated strain gauges provide consistent power readings throughout the pedal stroke
- ANT+ and Bluetooth LE: Connects wirelessly to compatible GPS computers, cycling watches, smartphones and training applications
- Rechargeable Battery: Built-in waterproof battery system provides long-lasting performance without replaceable coin-cell batteries
- HOLLOWTECH II Construction: Hollow-forged crank arms deliver an excellent balance of stiffness, strength and low weight
- HOLLOWGLIDE Chainrings: Hollow outer chainring improves rigidity, power transfer and front shifting performance under load
- 12-Speed Ultegra Compatibility: Designed for Shimano Ultegra R8100-series 2x12-speed road drivetrains
- Easy Calibration: Quick zero-offset calibration helps maintain accurate and dependable power readings
Product Overview
The Shimano Ultegra FC-R8100-P is a premium dual-sided power meter chainset designed for cyclists who want accurate training data without compromising drivetrain performance. Precisely calibrated strain gauges are integrated into the crank arms, measuring power from both sides with a claimed accuracy of ±2%. This provides valuable information for structured training, pacing, performance analysis and monitoring left-to-right power balance.
The integrated power meter communicates with compatible devices using ANT+ and Bluetooth Low Energy, allowing riders to record power, cadence and related training data on supported cycle computers, watches and smartphones. Firmware updates and system checks can also be carried out through Shimano’s compatible E-TUBE software.
The FC-R8100-P uses Shimano’s proven HOLLOWTECH II construction, combining hollow-forged aluminium crank arms with an integrated 24 mm axle for efficient power transfer and dependable stiffness. HOLLOWGLIDE outer chainrings reduce flex and support fast, accurate front shifting, even when changing gear under load. Developed specifically for Shimano 12-speed HG chains and Ultegra R8100 drivetrains, this chainset delivers smooth shifting and race-ready performance for training, competition and fast road riding.
Specifications
- Brand: Shimano
- Series: Ultegra R8100
- Model: FC-R8100-P
- Product Type: Dual-sided power meter chainset
- Discipline: Road cycling
- Drivetrain: 2x12-speed
- Power Measurement: Dual-sided
- Claimed Accuracy: ±2%
- Connectivity: ANT+ and Bluetooth Low Energy
- Battery Type: Integrated rechargeable lithium-ion battery
- Calibration: Zero-offset calibration supported
- Crank Construction: Hollow-forged aluminium
- Crank Technology: HOLLOWTECH II
- Chainring Technology: HOLLOWGLIDE
- Axle Diameter: 24 mm
- Chainring Options: 50/34T or 52/36T, depending on selected version
- Crank Length Options: 170 mm, 172.5 mm or 175 mm, depending on selected version
- Chain Compatibility: Shimano 12-speed HG road chain
- Bottom-Bracket Compatibility: Shimano HOLLOWTECH II road bottom brackets
- Frame Compatibility: Suitable for compatible road frames with 135 mm or 142 mm rear O.L.D.
- Colour: Series colour / dark grey
Ideal For
- Road cyclists following structured power-based training plans
- Racers seeking accurate pacing and performance data
- Shimano Ultegra R8100 drivetrain upgrades
- Riders monitoring power, cadence and left-to-right balance
- Competitive and enthusiast cyclists seeking an integrated power meter
What’s Included
- 1 × Shimano Ultegra FC-R8100-P dual-sided power meter chainset
- 1 × Integrated rechargeable power meter battery
- 1 × Power meter charging cable
- Chainrings in the selected 50/34T or 52/36T configuration
Compatibility Notes
Designed for Shimano Ultegra R8100-series 2x12-speed road drivetrains and compatible Shimano 12-speed HG chains. A compatible Shimano HOLLOWTECH II road bottom bracket is required and is normally sold separately. Before ordering, confirm the required crank-arm length, chainring combination, frame clearance and bottom-bracket standard.
Care & Notes
Installation should be completed using the correct Shimano procedures and torque settings. Fully charge the power meter before first use, perform a zero-offset calibration regularly and keep the firmware updated through compatible Shimano E-TUBE software. Clean using mild soap and water, avoid directing high-pressure water at the power meter and inspect the crankset regularly for wear, damage or loose fasteners.
Why Buy From LK Bikes
LK Bikes offers premium Shimano road components supported by expert advice, professional workshop knowledge, reliable service and strong aftersales support.
