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4iiii Precision 3 Power Meter - Ultegra R8000


The 4iiii Precision 3 Power Meter has a number of positive things going for it: it boasts an industry-leading 800-hour battery life, an industry-leading +/-1% accuracy, and an industry-leading three-year warranty. You may have gathered that this is a power meter that is industry leading, in many respects.

If you’re looking to take your training to the next level, then a power meter is the way to do that. 4iiii have been perfecting their craft in producing these devices for a number of years and already produce one of the cheapest, lightest, and most accurate devices on the market, with the Precision 3 the Canadian-based company have improved on all three points.

Simply Connect And Go

The 4iiii Precision 3 is chocked full of cutting-edge tech but is still simple to install. As you’d imagine, it’s Bluetooth and ANT+ enabled, so it’ll pair easily with your choice of bike computer or indoor trainer. Whether you’re road racing or smashing intervals indoors, it’s the perfect partner.

From your device arriving pre-installed on a brand-new crank, to getting out for a ride is simple. Installation is the same as installing any Shimano Ultegra left-side crank arm. Once you’ve installed the crank arm, it’s merely a case of pairing with the app/your computer and that’s it: the world of watts, metrics, and marginal gains is your oyster! Within the app you can also update the firmware, check battery status, and calibrate your power meter.

Reliable And Accurate Power Data

It’s all well and good carting about a piece of tech that spits out fancy numbers but if the numbers aren’t accurate then there’s little point to doing so. Fear not, with the 4iiii Precision 3 power meter, you can rest assured the data you get is both accurate and reliable to +/-1%. With many years in the market, 4iiii are firmly established as reputable producers of cycling tech. So confident in their products, the brand back them all with a three-year warranty.

Born in the Canadian Rockies, this isn’t a delicate piece of equipment. It’s rated to IPX7 for water resistance, so you can confidently ride into the wind and rain.

Product Features:

  • 800 hours of battery life
  • Product status indication LED light – for wake up (green), zero offset (blue) and low battery (red)
  • Uses patented 3D strain-gauge technology to deliver +/- 1% accuracy
  • Slim design that fits almost every frame
  • Three-year warranty
  • Waterproof Rating: IPX7
  • Weight (in addition to crank arm): 9g
  • Backwards compatible with current Precision Drive Side Power Meter
  • Active temperate compensation
  • Feature and firmware upgradability via the app
  • Coin-cell powered by a CR2032 battery
  • Compatible with third party training apps such as Zwift, TrainerRoad, SYSTM, and more


  • Cadence Range: 30-170 RPM
  • Power Range: 0-4000 Watts
  • Length: 63.79mm
  • Width: 26.42mm
  • Height: 5.5mm
  • Operating Temperature: 0 to 50°C
  • Storage Temperature: -40 to 60°C
  • Communication Protocols: ANT+, Bluetooth®
  • Ultegra R8000
  • Precision 3
  • Road
  • Shimano
  • 4iiii

How long will it take to arrive?

Please check the stock availability notice on your item when placing your order. This item is:

How will I know it has been sent?

You will receive an email to confirm when your item has been sent.

You can also check the status of your order and individual items by accessing My Account details and following the prompts.

Please allow 10 working days from dispatch of your order before notifying us of any late deliveries.

It may be advisable to check with your neighbours to see if a parcel has been left with them, check any outhouses you might have where it may be left if it cannot fit through your letterbox and contact your local sorting office to see if the item has been returned to the depot as undelivered and awaiting collection.

If I'm not completely happy with my item?

Please see our returns policy.

Customer Reviews

Overall Rating : 5.0 / 5 (2 Reviews)
  • 2 5 star reviews
  • 0 4 star reviews
  • 0 3 star reviews
  • 0 2 star reviews
  • 0 1 star reviews

Top Customer Reviews

Where reviews refer to foods or cosmetic products, results may vary from person to person. Customer reviews are independent and do not represent the views of The Hut Group.

Can’t fault it

Having ridden with power for a long time I wanted a cheap power meter for one of my bikes I wasn’t fussed about it being single sided. Fitting is simple and calibrating using the app was easy. Having now used it for well over a month most days I can say it’s reliable and the figures are pretty stable I haven’t used it in the winter yet or rain but no issues with connection and seems like a solid unit only time will tell but for the money it’s perfect unless your pro buy one off these

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Easy to fit

This new 4iiii power meter fits my canyon with no problems (the previous version didn’t fit between the crank and the chainstays). Easy to install, easy to link to the garmin. Great service from pro bike kit.

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