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4iiii GRX RX810 Precision 3+ Single Leg Power Meter
4iiii GRX RX810 Precision 3+ Single Leg Power Meter
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4iiii GRX RX810 Precision 3+ Single Leg Power Meter 1
4iiii GRX RX810 Precision 3+ Single Leg Power Meter 2

4iiii GRX RX810 Precision 3+ Single Leg Power Meter

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rating(1 customer reviews)
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MSRP: $389.99
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Now With Integrated Bike Tracking

The 4iiii GRX RX810 Precision 3+ Single Leg Power Meter represents their most powerful unit to date, compressed into a smaller, lighter package and featuring support for Apple Find My.

Whether you're fighting for a Kona qualification spot, logging countless hours on virtual riding platforms or looking to better your time up the local KOM segment, you want accurate and reliable tools to unlock your potential. With up to 800 hours of battery life, +/-1% accuracy and backed by our industry-leading 3-year warranty, the PRECISION 3+ Powermeter will be your trusted tool for years to come.


  • Apple Find My compatible.
  • +/- 1% accuracy with 3 strain gauges to measure all forces in your pedal stroke.
  • Automatic Terrain Selector detects the terrain you're riding on for more responsive cadence and power feedback/data.
  • Indicator Light shows at a glance when your power meter has turned on, performed a successful Zero-offset, or has a low battery.
  • With an ultra low profile design, the PRECISION 3+ is compatible with more bike frames than ever before.
  • 3-year warranty


  • Accuracy: +/- 1%
  • Battery Type: CR2032 Coin Cell
  • Battery Life: up to 800 hours
  • Waterproof Rating: IPx7
  • Cadence Range: 30 - 170 RPM
  • Power Range: 0 - 4,000 W
  • Height: 5.5mm
  • Weight: 9g
  • Operating Temperature: 0 to 50 °C
  • Communication Protocols: ANT+, Bluetooth

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

Signature will be required when taking delivery of this product.


170mm - Left Leg

Mfg PartNum: PML300-S17B00X 

172.5mm - Left Leg

Mfg PartNum: PML300-S17C00X 

175mm - Left Leg

Mfg PartNum: PML300-S17D00X 


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Gravel Power Meter
by Mr. Aluminum Frame
Rust Belt
1 of 1 customers found this review helpful.

Got this for my Canyon Grizl, totally unnecessary for someone of my 'abilities' but fun and should help with training etc. Using this on the rx600 grx crankset, installation was easy. Works well so far. Survived a very wet gravel race without issue.

Reviewed 5/9/2024
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