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The Lightest Power Meter On The Market
The 4iiii GRX RX810 Precision 3 Powermeter delivers industry-leading accuracy and reliability when you need it most. 4iiii's patented 3D Strain Gauge technology assures that the data you depend on will help lead you to your own personal best.
Packaged into a durable lightweight design and compatible with ANT+ and Bluetooth Smart headunits, the Precision 3 will help you train harder and smarter.
A ride-ready 4iiii Precision 3 includes and comes preinstalled on a brand-new GRX RX810 left-side crankarm, compatible with bottom brackets using the Hollowtech II interface.
Whether you are fighting for a Kona slot, spending countless hours on the indoor trainer or striving for a personal best — one thing is clear, success takes time. With up to 800 hours of battery life, +/-1% accuracy and weighing in at only 9 grams, the Precision 3 Powermeter will be your trusted training tool for years to come.
Features:
Hollowtech II left side crank arm with built-in 4iiii power meter
+/- 1.0% accuracy lets you collect training data with confidence
Accelerometer with gyroscope offers detailed cadence readings
9g design is one of lightest crank arm-based meters on the market
800 hours of battery life via replaceable CR2032 battery
Pair to the 4iiii app with ANT+ and Bluetooth SMART to transfer data
Available in 170-175mm crankarm lengths
Compatible with Shimano GRX series drivetrains
Power range: 0-4000W
Cadence range: 30-150RPM
IPX7, IPX5 waterproof rated
Sensor weight: 9g
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.
Reviews Ordered by Most Relevant First
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1 stars
Excellent power meter with plenty of clearance
by Jamie
Cycling Enthusiast
State College, PA
Added this to my gravel bike, which I mostly ride on road. In order to fit wide tires, the chainstays on the bike flare out, leaving there to be little room between crank and frame. The new low profile 4iiii power meter fits just fine (the old one wouldn't)!
Otherwise, this power meter works like previous 4iiii power meters, which is to say, excellent. One thing to note, unlike previous versions, this doesn't support Chipolo features, so you can't use the power meter to locate a lost bike. I never used this feature (thankfully) on my other 4iiii PM, so I can't really I really miss it.
Reviewed 1/27/2023
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Just awesome
The single best purchase that I have made in cycling since I bought my first road bike. Easy to install , accurate, virtually no added weight and the information is invaluable to anyone trying to get faster! Do yourself a favor and get one of these. They are a great price as well!
Reviewed 3/20/2023
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