4iiii Innovations Power Meter Single Sided Shimano GRX810

4iiii Innovations Power Meter Single Sided Shimano GRX810

The 4iiii GRX RX810 Precision 3+ power meter is a single-sided powermeter for cranks of the Shimano RX810 series. It measures the power at the left crank arm. The 4iiii power meter is now available in the 3rd generation. The actual powermeter weighs in at only 9g and sits well protected inside the left crank arm. The widely used CR2032 battery lasts for a whopping 800 hours of operation of the powermeter. The measurement accuracy is ± 1%. For mounting the 4iiii Power L GRX RX810 you need the TL-FC16 tool.

Highlights and Downsides
single-sided power measurement with high accuracy (± 1%)
800h battery life with a CR2032
integrated cadence measurement
very low weight (adds only 9g to the crank arm)
automatic temperature compensation
easy to swap between bikes
compatible with all Shimano GRX RX810 cranks
works with many bike computers and smartphones (ANT+ & Bluetooth)
3-year manufacturer’s warranty
Apple Find My feature