Rechargeable crank arm power meter
INPEAK Ultegra R8100 Rechargeable Power Meter Crank Arm
A genuine Shimano Ultegra FC-R8100 left crank with INPEAK's power sensor built on, charged by a magnetic USB lead rather than coin cells. Swap it for your existing left arm to add power and cadence to the bike.
Highlights
Why we rate it
Straight swap
Replaces the left arm of your Ultegra chainset, so there is nothing to change on the drive side.
Rechargeable cell
Magnetic USB charging gives around 90 hours between top-ups, with a full charge in roughly two hours.
Works with everything
Dual ANT+ and Bluetooth broadcast pairs with Garmin, Wahoo, smartphones and indoor apps such as Zwift.
Stable readings
Automatic temperature compensation and an accelerometer/gyroscope keep data consistent as conditions change.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Compatibility
- Shimano Ultegra FC-R8100 cranksets (Hollowtech II, 24 mm axle)
- Measurement
- Single-sided (left crank); power and cadence
- Accuracy
- ±2%
- Power range
- 20–2000 W
- Cadence range
- 20–200 rpm
- Connectivity
- ANT+ and Bluetooth Low Energy
- Water resistance
- IP67
- Temperature compensation
- Automatic, -5°C to +50°C operating range
- Calibration
- Manual zero offset
- Battery
- Rechargeable Li-Po (110 mAh), magnetic USB charging
- Battery life
- Up to 90 hours riding; full charge in about 2 hours
- Sensor weight
- Approx. 10 g added to the crank arm
- App
- INPEAK MANAGER for firmware updates and scale factor; Zwift-compatible mode
In the box
- Includes
- Left crank arm with integrated power meter, magnetic USB charging cable, device data card, sticker set, quick-start manual (USB wall charger not included)
Ordering
Available from The Cycle Collective
Available to order through The Cycle Collective in Dorking. For availability, setup or advice, call 0203 148 6764 or email hello@thecyclecollective.cc.