The INPEAK Ultegra R8100 PowerCrank-E TWiN2 Power Meter Crankset is a dual-sided power meter built into a Shimano Ultegra FC-R8100 crankset for accurate road and gravel training data. Its refreshed TWiN2 design uses extra strain gauges on the sides of the crank to give more measuring points and sharper power data. It measures power, cadence, left/right balance, and cycling dynamics, while ANT+ and Bluetooth Low Energy send the data to compatible devices and apps.Key Features and Benefits: Dual-sided TWiN2 power measurement: This system measures power from both legs, so you get left and right data instead of one-sided estimates. This helps show how each leg contributes to your total output, which gives you clearer data for pacing, training blocks, and post-ride review.Additional side strain gauges: The refreshed design adds strain gauges to the sides of the crank, which creates more measuring points during each pedal stroke. This improves how the system reads force through the crank, so your power data stays more precise when effort changes.Shimano Ultegra FC-R8100 crankset integration: The power meter is built into a Shimano Ultegra FC-R8100 crankset, so it keeps a clean road setup with proven Shimano crank performance. This gives you power data without adding large external units, so the bike keeps a neat and race-ready finish.±2% measurement precision: The system records power with a stated precision of ±2%, which supports clear training zones and repeatable ride data. This helps you track effort over time, compare sessions, and make better choices during structured training.Active temperature compensation from -5°C to +50°C: Automatic temperature compensation adjusts the measurement as conditions change, so heat and cold have less effect on accuracy. This keeps the data stable across varied weather, which is useful for long rides and mixed-season training.ANT+ and Bluetooth Low Energy connectivity: The power meter sends power, cadence, and ride data through ANT+ and Bluetooth Low Energy, so it works with many head units, watches, apps, and indoor platforms. This makes it easier to use the same data across outdoor rides, turbo sessions, and training software.Rechargeable Li-Po battery with up to 90 hours of use: The 110 mAh rechargeable battery gives up to 90 hours of ride time and charges with the included magnetic USB cable. A full charge takes about 2 hours, so regular charging is simple and reduces the need for replacement batteries.IP67-rated low-profile housing: The sealed housing is built to resist water and dirt, while its low-profile shape suits road and gravel bikes. This helps protect the electronics in poor weather and keeps the unit discreet on the crank. Consistent power data helps you train with more control. The INPEAK Ultegra R8100 PowerCrank-E TWiN2 records detailed metrics such as torque effectiveness, pedal smoothness, cadence, cycling dynamics, and left/right balance. Each unit is individually calibrated, which supports reliable data from the first ride and helps you judge effort with less guesswork.Choose the INPEAK Ultegra R8100 PowerCrank-E TWiN2 Power Meter Crankset for a clean Shimano-based power upgrade with dual-sided data, strong battery life, and accurate ride feedback for road and gravel training.Specifications of the Power Meter:Measurement precision: ± 2% Power measurement range: 20-2000 W Cadence range: 20-200 rpm Weight: 10 g (INPEAK device) Case tightness: IP67 Manual zero-offset calibration: Yes Temperature compensation: Yes Gyroscope + Accelerometer: Yes Torque Effectiveness: Yes Pedal Smoothness: Yes Cycling Dynamics: Yes (TWiN2) Balance L/R: Yes (TWiN2) Operating temperature: from -5°C to +50°C Storage temperature: from -20°C to +50°C Battery specifications:Battery type: "Li-Po, rechargeable "Battery capacity: 110 mAh Battery autonomy in use: max. 90 hours Battery autonomy in sleep: max. 6 months Battery autonomy in ShipMode: max. 24 months Charging time (0% -> 100%): 2 hours Low battery notification: Yes Battery charging temperature: from +5°C to +40°C Battery lifetime: Less than 20% capacity loss after 300 full cycles. Approximately 6 year lifetime. Required charger: 5VDC, 1000mA (not included)Software specifications:Software update from INPEAK MANAGER App: Yes Modification of “Scale Factor”: Yes Zwift Compatible Mode: Yes ANT+ Compatibility: Yes Bluetooth Low Energy Compatibility: Yes Auto sleep: Yes Auto wake-up: Yes Package contents:Crank with integrated power meter USB charging cableBrief instruction manual Sticker setDevice data card