The INPEAK Powercrank-E Ultegra R8100 USB Power Meter
Meet the INPEAK Powercrank-E Ultegra R8100 USB Power Meter – a lightweight, accurate, and super convenient upgrade for riders who want to train smarter without the hassle of replacing batteries.
Quick and easy charging via a magnetic USB cable
What really sets this power meter apart is its built-in rechargeable battery. No more swapping coin cells or worrying about running out mid-ride. Just plug it in with the included magnetic USB cable, and you’re good to go. A full charge takes around 2 hours and delivers up to 90 hours of ride time, making it ideal for both daily training and long-distance cycling.
Slim Design & Lightweight Build
The ultra-slim sensor design ensures compatibility with frames that have tight clearance between the chainstay and crank arm, while adding only 10 grams to your setup.
Accurate Power Measurement
With high accuracy and a deviation of ±2% and a wide power range, you’ll get reliable data every ride. It measures power from the left crank arm and doubles it to estimate total output, which works well for most riders.
Connectivity & Smart Features
Thanks to ANT+ and Bluetooth connectivity, you can easily pair it with almost any bike computer or training app. Add in automatic temperature compensation and cadence measurement, and you’ve got a complete training tool that performs in all conditions.
Key Features & Specifications
- Internal rechargeable battery (no replacements needed)
- USB charging via magnetic cable (full charge in ±2 hours)
- Up to 90 hours battery life
- High accuracy with a deviation of ±2%
- Single-sided measurement (left crank)
- Lightweight design (only 10 grams)
- Slim sensor fits tight frame clearances
- Measures cadence (20–200 RPM)
- Power range: 20–2000 W
- ANT+ and Bluetooth compatibility
- Automatic temperature compensation (-5°C to +50°C)
- Compatible with Shimano Hollowtech II (24 mm axle)
- Durable and water-resistant (IP67)
Compatibility
Designed for Shimano Ultegra R8100, but also compatible with other Hollowtech II cranksets like 105 R7100 and Dura-Ace R9200. Keep in mind slight Q-factor differences between 11-speed (146 mm) and 12-speed (148 mm) cranksets when mixing components.
In the Box
- INPEAK Powercrank-E Ultegra R8100
- Magnetic USB charging cable
- User manual
- Sticker set
- Device data card
