Left-Side PRECISION 3 Powermeter - Ride Ready

Non-Drive Side Precision 3 Powermeter

Ride Ready
$384.99 USD

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.


How Does It Work?

A Ride-Ready PRECISION 3 pod is already preinstalled on a brand-new Shimano crank arm at our factory. The moment you order, our fulfillment team will get it on its way to you, and you should be able to ride with power as soon as it arrives. With up to 800 hours of battery life, +/-1% accuracy and backed by our legendary 3-year warranty, the PRECISION 3 Powermeter will be your trusted training tool for years to come.

In The Box

Once your ride-ready PRECISION 3 Powermeter arrives, it just needs to be installed on your bike using the standard Shimano crank installation process. Connect a headunit or computer, and you can start riding with power!

Warranty & Durability

Ridden through rain storms at Strade Bianche, mud filled cross country mountain bike races, and even tested amidst the salt spray of the ocean on Oracle Team USA’s America’s Cup competitors, you can be assured that your 4iiii power meter will be as tough as you are and is backed with an industry leading 3-year warranty. All 4iiii power meters are IPX7-rated for water immersion up to one meter and backed with an industry-leading 3-year warranty.

  1. 4iiii Warranty Policy


  • Battery Life

    With up to 800 hours of battery life, you won’t have to worry about changing your battery for years to come.

  • Light Weight

    At only 9 grams the Precision 3 Powermeter weighs about the same as a sip from your water bottle. Our goal is to help you get faster, not to slow you down.

  • Ultra Low Profile

    With an ultra low profile design, the PRECISION 3 is compatible with more bike frames than ever before.

  • Accuracy in 3D

    Not everyone has the perfect pedal stroke. With +/- 1% accuracy, 4iiii is the only crank-based power meter to use 3 strain gauges to measure all forces in your pedal stroke.

  • 3 Year Warranty

    A lot can happen in 3 years. You probably won’t need to use it, but it’s reassuring to know that all 4iiii power meters are backed by an industry leading 3-year warranty.


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


A 4iiii PRECISION 3 power meter is available ready to ride on any of the crankset configurations listed below. If your desired crankset isn't listed, we may have other products that are compatible.

  • Shimano 105 FC-R7000
  • Shimano Ultegra FC-R8000
  • Shimano Ultegra FC-R8100
  • Shimano Dura-Ace FC-R9100
  • Shimano Dura-Ace FC-R9200
  • Shimano GRX FC-RX810
  • Shimano XT FC-M8100
  • Shimano XTR FC-M9100


If the weather or climate make riding outdoors tough, your 4iiii power meter can be used with all popular indoor-training apps, such as Zwift, TrainerRoad, Wahoo SYSTM, Rouvy, and more. Simply use your favourite app’s connection procedure over ANT+ or Bluetooth Smart, put your bike on a trainer, and get riding!

  1. Indoor Training


  1. User Manual
  2. Frame Clearance Guide
  3. iOS App
  4. Android App

Customer Reviews

Based on 10 reviews
Very Unreliable

My Precision 3 just died for the second time now within one year, both times happened to be right before a target race. The first time it took almost a month to get back from warranty repair so I'm not looking forward to dealing with that process again. I think I may have to move on to a different brand and sell my 4iiii unit once I get it back from repair again.

Great on Specialized Tarmac

I have used the product for approximately 2 months on my Tarmac and the battery has only dropped 1%, pairing with my bike computer was effortless and so far I have no complaints!.

Be careful and consider spending a bit more money to get a product from a more reputable company!!!

My unit has already started malfunctioning in less than a year and their solution is for me to send it back for 3 weeks leaving me with a useless bike. On a product this expensive, I would expect customer service that ensures you don't need to give up your bike. While this is consistently the cheapest power meter, you may be getting what you pay for and I would advise you to look elsewhere!

Hi Alex,
Sorry to hear that your powermeter is malfunctioning. Please keep an eye on your inbox. Our support team will be getting in touch with you again shortly to find a solution so you are not without your bike.
The 4iiii Team

Great on my Canyon Grail AL

After lots of confusion as to whether or not the Precision 3 would fit on my Canyon Grail AL, I reached out to 4iii customer service. They confirmed that it would in fact fit, so I purchased one. With the snow outside, I currently have the bike as my indoor trainer on Zwift. Easy to "scale" the single side into double side data. I'm typically 49/51 power as measured with my Assioma power pedals, and I've scaled to the Precision 3s to reflect that. The power data is within the margin of error when compared to the data tracked by my Wahoo Kickr Core. So far, so good. No frame clearance or connectivity issues with my Garmin 830. Docked a star because the battery shipped with 78% battery life.

Kelli Couture
Awesome Power Meter

I’ve had a couple of different brand power meters, and this one has been great so far! I don’t have too many miles on it yet, but install and setup was super easy. Also I love the look and super minimal design. Looking forward to testing it out longer term for battery, and power readings, but so far it has been very accurate compared to my other power meters as far as data goes.