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4iiii Shimano GRX RX810 Precision 3

€389.99 RRP: €399.00

Prices incl. VAT plus shipping costs

Delivery time 3-7 Days

Crank Length:

  • SW10871.1
The 4iiii Shimano GRX RX810 Precision 3 power meter is a single-sided powermeter for cranks of... more
4iiii Shimano GRX RX810 Precision 3

The 4iiii Shimano GRX RX810 Precision 3 power meter is a single-sided powermeter for cranks of the Shimano GRX series. It measures the power on the left crank arm. The 4iiii power meter is now in its 3rd generation. The actual powermeter weighs only 9g and sits well protected inside the crank arm.

The widely used CR2032 battery lasts for a whopping 800 hours of operation. The measurement accuracy is ± 1%.

The special feature of Shimano: the 4iiii GRX 810 Precision 3 Powermeter fits not only to cranks of the RX810 series, but to all GRX cranks (eg RX600).

Since Shimano is most commonly found on road bikes, the 4iiii RX810 Precision 3 power meter is also great for watt based training at training camps - given the rental bike is equipped with a GRX crank.

The 4iiii Ultegra R8000 Precision 3 power meter is available in the common crank lengths of 170, 172.5 and 175mm. Since the 4iiii power meter is permanently mounted to the left crank arm, this is always included.

Thanks to ANT+ and Bluetooth Smart, the 4iiii power meter is compatible with all ANT+ capable bike computers and smartphones with Bluetooth Smart technology.

Features of the 4iiii Precision 3 power meter

✔ Battery life of 800 hours (CR2032).
✔ LED status light
✔ Patented technology for an accuracy of ± 1%
✔ Ultra-flat design that fits in almost any frame
✔ 3-year manufacturer's warranty
✔ Waterproof and rugged design
✔ Weighs in at only 9g - the lightest power meter on the market
✔ Active temperature compensation
✔ Over-the-air function and firmware updates possible
✔ Compatible with third-party apps such as SYSTM, Zwift, TrainerRoad, and others

Compatibility with frame and brake

Since the power meter is placed on the inside of the crank arm, a clearance of at least 10mm between crank and chain stay / direct-mount brake is needed. Especially bikes with direct-mount brakes may cause problems.

To ensure your bike is compatible with the 4iiii power meter, please perform a simple check with a 10mm hex key:


Sensor Location:

left crank arm


± 1%


adds 9gr to left crank arm

Battery Life:

about 800 hours (CR2032)

Battery Replacement:

Tool free

Wireless Technology:

ANT+, Bluetooth Smart Ready

Operating Temperature:

0 to 50°C

Storage Temperature:

-40 to 60°C

Firmware Upgrades:

yes, wireless

Compatible Software:

Training Peaks, Strava, Garmin Training Center and others

Power Range (Watts):

0 to 4000

Cadence range (rpm):


Crank Compatibility:

Shimano GRX

Available lengths:

170, 172.5, 175mm

Active temperature compensation

Accelerometer based cadence measurement

In the pack

✔ 4iiii Shimano GRX Precision 3 power meter
✔ Left crank arm
✔ Battery
✔ Manual

Crank manufacturer: Shimano
Carbon or aluminum: Aluminum
Single or double sided: left side
Road or MTB: Road
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