Left-Side PRECISION Powermeter - Factory Install

Côté Opposé à l'Entraînement Precision Capteur de Puissance

Installation en usine
$274.99 USD

Used to pace attacks up the Alpe D’Huez in the Tour de France and to hammer on the Queen K during the Ironman World Championships, the PRECISION Powermeter delivers accuracy and reliability when you need it most. Through our patented 3D Strain Gauge technology, you can be assured that the data you depend on will lead you to your own Yellow Jersey. Packaged into a durable lightweight design and compatible with ANT+ and Bluetooth Smart headunits, PRECISION will help you train harder and smarter.


How Does It Work?

Through our custom install process, PRECISION can be installed on a wide variety of crank arms. We’ll work with you to determine the best fit for your bike frame. Once you place your order, we get in touch with the shipping logistics. You’ll then send us your left crank arm, we install a PRECISION Powermeter on it, and we ship it back to you.

Important: You need to use the frame clearance guides to ensure there is space between your crank and frame for the PRECISION pod.

In The Box

After a factory installation, your crank arm will be returned to you with a PRECISION Powermeter pod attached and ready to ride. Reinstall the crank arm back onto your bike, 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


  • 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.

  • Battery Life

    Our impressive long-lasting battery life means you won’t have to worry about frequent battery changes.

  • 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.


Type Non-drive Side
CR2032 Coin Cell
100+ hrs
IPx7, IPx5
Cadence Rating 30 - 150 rpm
Power Range 0 - 4,000 W
7.5 mm
9 g
Operating Temperature 0 - 50 ºC
Storage Temperature -20 - 50 ºC
Protected against low pressure water stream from any angle.
Withstands incidental exposure to water of up to 1 meter for up to 30 minutes.

Apple Find My

Offering the peace of mind in knowing where your power meter is.

Battery Life

Our impressive long-lasting battery life means you won’t have to worry about frequent battery changes.

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.

Automatic Terrain Selector

Detects the terrain you’re riding on for more responsive cadence and power feedback/data. Ride the roads less traveled with confidence.

Ultra Low Profile

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

Light Weight

4iiii makes the lightest power meter on the market. We’re committed to helping you get faster, one gram at a time.


Designed to work in our tough environment. With an IPX7 waterproof rating you can be assured that your power meter can handle the toughest conditions.

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.

Left Right Balance

A dual power meter measures the power from each individual leg to calculate your total power output.

Cycling Metrics

Get more data like pedal smoothness and torque effectiveness to analyze and optimize your pedal stroke.

Dual-Channel ANT+ & Bluetooth Smart

4iiii power meters communicate their measurements over both ANT+ and Bluetooth, letting you read and record your power numbers on an enormous catalog of head units, sport watches, smartphones, and computers.

À L'intérieur

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

Installation en Usine

  • Clearance Check

    Vérification de L’Espacement

    Avant d’acheter un capteur de puissance, vérifiez qu’il y a suffisamment d’espace entre votre manivelle et le cadre de votre vélo pour y installer le module du capteur de puissance. Pour vous assurer de l’espacement et la comptabilité, vous devrez nous envoyer une photo nette de l’espace avant de nous envoyer votre manivelle ou votre pédalier. En cas de doute, contactez-nous pour obtenir de l’aide.

    1. PRECISION 3+ Clearance
    2. Espacement Pour le PRECISION 3
    3. Espacement Pour le PRECISION
    4. Espacement Pour le Podiiiium
    5. Support
  • Shipping


    Shipping instructions will be sent to you with your order confirmation, including the UK address to send your crank to, including the Benelux address to send your crank to. Find an appropriate package for your crank and send it on its way, we recommend a tracked and signed for service.

  • Installation

    Fabrication et Installation

    Le module sera fixé sur votre manivelle à l’aide des outils, des techniques et du personnel que nous utilisons pour tous nos produits, et devra passer les mêmes contrôles de qualité. La fabrication devrait prendre entre 7 et 10 jours ouvrables, et vous recevrez un lien de suivi afin que vous puissiez suivre votre manivelle tout au long du processus.

  • Reinstallation

    Renvoi et Réinstallation

    Une fois la fabrication terminée, nous vous renverrons votre manivelle ou votre pédalier en utilisant le mode d’expédition que vous avez sélectionné lors de la commande. Dès que vous l’aurez reçu, vous pourrez réinstaller l’ensemble sur votre vélo.

  • Go Ride!

    Partez Rouler !

    Une fois votre manivelle ou votre pédalier réinstallé(e) sur votre vélo, partez vous amuser ! Les capteurs de puissances 4iiii sont garantis 3 ans, compensent la température et ont un indice d’étanchéité IPX7. Vous pouvez donc être sûr qu’ils sont aussi robustes que vos entraînements.

    1. En Savoir Plus Sur ANT+ et Bluetooth Smart
    2. Pourquoi S’entraîner Avec Un Capteur De Puissance


  1. Guide de Démarrage Rapide
  2. Clearance Guide (Letter)
  3. Clearance Guide (A4)
  4. iOS App
  5. Android App

Customer Reviews

Based on 38 reviews
Adam Harita
Works Every Time

I actually have two Precision power meters, one on my gravel bike and one on my road bike. Both are using SRAM AXS Force cranks.

I've never had any issues with either one, they simply just work every time I ride. The battery seems to last a long time, I don't think I've changed the one on my road bike and it's been on for over 1 year. I don't remember changing the one on my gravel bike which is now well over 2 years old but maybe I have.

I think the main point is that I don't think about them, they are there and they connect immediately to my Garmin and they just do their job without any issues.

Bryan Bergstedt
4iiii Precision Power Left Side Factory Install

Just ordered a third Precision power meter form 4iiii. The first two failed in an identical manner outside of warranty with ~3 years use each. I only hope that this new one will last a little longer. Thankfully, 4iiii offered a discounted price this time around due to the failure. My recent new purchase started out uneventful, like both of my previous purchases with overnight FedEx shipping (my crank) to 4iiii. I was not given any time frame for installation so after 1.5 weeks without any update I contacted 4iiii to see if they could provide an apprx time frame for installation. They told me their current backlog was putting installations out two weeks. In the past it was more like 2 days, but I suppose that's the way things go these days? Sure enough, at 16 days after receipt by 4iiii my install was complete. A couple of days after that 4iiii started shipping process back to me. I'm without a bike throughout this process so the timing isn't exactly what I wanted, but logistics are just different these days so I know I've got no choice but to roll with it. Here's the hitch... 4iiii sent my crank back via Canada Post 14 days??? Total time without a bike... Five Weeks! After two product failures and sloooow shipping decisions on my current order, I'll look for other options next time I'm in the market for a power meter. Not sure what happened to these guys, but this time around is like night and day compared my past experiences.

4iiii Rockssss

I've been very happy with the 4iiii experience from start to finish. It came highly recommended from the community and has been an excellent addition to my training toolkit. The order and install went very smooth. I shipped my crank to 4iiii the night before a three week vacation and the crank was waiting for me when I returned. I re-installed my crank and the 4iiii lit up on first pedal and connected to my Wahoo computer flawlessly. It's been great having this additional metric on my rides and is helping me maintain my conditioning. Sweet product, excellent customer service, and a great price.

Jim Halay
Eats Batteries!

Works as described but I don't think I ever got 100 hours of use from any single battery. Not sure if this is normal or not. I have the same left side only on both of my bikes. The power meters do work very well though and seem to be very accurate.

Bob Spatz
Very pleased

The process worked as described. As soon as I placed my order, I was emailed detailed instructions on how to ship, along with the customs paperwork required. Their tracking app kept me updated on progress and I had my crank arm back within a few weeks. The power meter works great and the software is easy to use. You can even adjust for your Left/Right imbalance if you know your percentage from a 2-sided meter. Overall, a great experience.