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4iiii PRECISION Shimano Ultegra R8000 Power Meter

Josh Matthew November 29, 2020
5.00 out of 5 based on 14 customer ratings
(14 customer reviews)

$349.99

4iiii’s PRECISION power meter combined with Shimano’s Ultegra R8000 groupset

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Description

4iiii PRECISION Shimano Ultegra R8000 Power Meter

Introducing the all new 4iiii PRECISION Shimano Ultegra R8000 Power Meter. 4iiii has combined their patent pending 3-D tri-axial strain gauge technology, measured at +/- 1.0% accuracy, with Shimano’s best of breed Ultegra R8000 groupset. The result is one of the lightest, most affordable and most accurate direct force power meters available.

The PRECISION determines your total power based on the force that is generated by your left leg. This left-only design allows for a power meter that is lightweight and easy to install. Specifically, the power meter adds only 9 grams to your crank arm and is installed in about 10 minutes. In addition, the PRECISION is compatible with both ANT+ and Bluetooth SMART devices. This means you can use it with your favorite bicycle computer, watch or smart phone.

 

4iiii R8000 Power Meter Highlights

Most Affordable DFPM

The 4iiii PRECISION is one of the most affordable, ready to ride direct force power meters available.

High Level of Accuracy

The PRECISION is accurate to within +/- 1.0%. This compares to average accuracy of +/- 1.0-2.0% for most other power meters.

Lightest Power Meter

At only 9 grams of added weight, the PRECISION is the lightest power meter you can buy!

Easy to Install

Installation is a breeze. Just swap it out for your current left-side crank arm and you’re ready to ride! Installation takes minutes…not hours.

ANT+ & Bluetooth SMART

The power meter transmits data via both ANT+ and Bluetooth SMART so you can use it with a wide range of devices.

Options

The power meter is available in the following crank arm lengths: 165 mm | 170 mm | 172.5 mm | 175 mm

 

Compatibility

The 4iiii power meter is compatible with all Shimano Hollowtech II road cranks. Please contact us if you have questions on compatibility.

Please note, this product requires a Shimano Crankarm Cap Tool (sold by us separately) for installation.

 

In the Box

  • 4iiii PRECISION Shimano Ultegra R8000 Power Meter
  • CR2032 Battery
  • Quick Start guide

 

4iiii PRECISION Shimano Ultegra R8000 Specs

Name4iiii PRECISION Ultegra R8000
Bike TypeRoad
Location of Power MeasurementCrank Arm
Left or Both Legs MeasuredLeft only
Independent Left/Right MeasurementNo
InstallationEasy
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Weight9 grams (added weight)
Battery TypeCR2032 coin cell
Battery Life100 hours
Method of Cadence MeasurementAccelerometer
Warranty3 years

CUSTOMERS ALSO VIEWED

14 reviews for 4iiii PRECISION Shimano Ultegra R8000 Power Meter

  1. Avatar

    R. Gannon (verified owner)

    Works perfectly! No issues with the unit and super easy to use. I’m using with Wahoo bolt and is seamlessly easy. Had an initial fitting issue with frame clearance but Josh was super helpful and I was up and running same day. I wish more businesses were this way.

    • Power Meter City

      Power Meter City

      Hi Rob. Thanks for the review on your 4iiii PRECISION R8000. I’m glad we could get you squared away and I hope you continue to enjoy it.

  2. Avatar

    M SeN Brannon (verified owner)

    After watching countless YouTube videos and read many reviews, I decided the 4iiii was to be my entry into the power meter world. I made a great decision. Installing was easy, and syncing it to my Garmin edge 520 was trouble free. Synced the meter to the 4iiii app, and done. First ride I was getting readings all over the place. Then a friend suggested that I only use it for a 3 second power average. That was what I needed. I was looking for similar readings to what I see on my smart trainer, while using zwift. Really happy with my purchase.

    • Power Meter City

      Power Meter City

      Hi M. Thanks for dropping us a quick note on your 4iiii. Yes, 3 or 5-second power smoothing is definitely the way to go! We hope you continue to enjoy it and we are here if there is anything else we can do.

  3. Avatar

    John kneebee (verified owner)

    I’ve been using the 4iiii precision r8000 for about a month now and have logged 2k Mike’s with it. It has been flawless! I did several comparisons to its power numbers benchmarking against my wahoo kickr and it has been +/- about 2 or 3 watts which for a single sided unit for $350 is great to me. Also it is very easy to install and to calibrate. If I had to say one criticism it’s that it would be nice if it had an auto zero feature because sometimes I have forgotten to do the zero offset calibration pre ride. Other than that it’s great I would highly reccomend also side note shipping was very fast 2 days which was awesome!

    • Power Meter City

      Power Meter City

      Hi John. Thanks for this awesome review! Keep up the good work! We hope you continue to enjoy them and we are here if there is anything else we can do!

  4. Avatar

    Dayle James (verified owner)

    Couldn’t have been easier to sync with my wahoo and get on the road! Based on my experience with other power meters, this has been very accurate, great battery life, and handles well in weather. Now it’s on me to get my FTP up! Already looking at other 4iiii for my other bikes!

    • Power Meter City

      Power Meter City

      Hi there Dayle! Good choice for your power meter! We hope you continue to enjoy them and Yes, please let us know if there is anything else we can do!

  5. Avatar

    Luke Caldwell (verified owner)

    Power meter works great and it was cheaper than what I saw other places online. Customer service was top as well. They even called to make sure I had selected the correct one and had it shipped out same day.

    • Power Meter City

      Power Meter City

      Hi Luke. Thank you for leaving this great review on your 4iiii PRECISION Shimano R8000. We appreciate your business with us and we are here if there is anything else we can do!

  6. Avatar

    Marc Saunders (verified owner)

    Power meter was simple to install and configure on Garmin and Zwift, and delivery to a small island in the Atlantic was speedy!!

    • Power Meter City

      Power Meter City

      Hi Marc, we are glad you got your 4iiii PRECISION Shimano Ultegra R8000 Power Meter on time. We hope you continue to enjoy it! Please let us know if there is anything else we can do!

  7. Avatar

    Aaron Braswell

    Simple, fast, and awesome! Works great. Thanks for making it easy!

    • Power Meter City

      Power Meter City

      Hi Aaron. Thanks for this kind review. We are glad it worked great as expected! Please let us know if there is anything else we can do!

  8. Avatar

    Dennis Gately

    Receiving the crank arm with power meter in just 3 days was astonishing considering shipping & deliveries during the coronavirus. The crank arm was easy to install and I got the power meter up & running quickly. Pairing to my Garmin 820 took very little effort and I am now enjoying having my power data on display whenever I ride. Thanks 😊 4iiii & Power Meter City!

    • Power Meter City

      Power Meter City

      Hi Dennis. We are glad it worked perfectly as expected. Good luck on your future rides! We hope you continue to enjoy them and please let us know if there is anything else we can do!

  9. Avatar

    jpipkens (verified owner)

    First to the credit of Power Meter City; ordering was easy. I ordered on 8/3/20, it shipped on the 4th and was in my mailbox on the 7th! After pouring over reviews of Stages vs 4iiii I decided to go with this PM. The packaging and product itself are top notch, like opening an Apple iPhone. Installation was easy and took just minutes. No issues here with the app or connectivity. Everything synced well with my Wahoo Elemnt Roam. Calibration is easy and initiates right from my Wahoo computer. Just make sure the bike is perfectly still and the cranks are perfectly vertical. My biggest concern was accuracy so I ran multiple comparisons. One was the crank PM paired with my Wahoo Roam. The other was my Wahoo Kickr controlled by and paired with Zwift in ERG mode. I put all of the .fit files into DCR Analyzer and was pleased with the result. The power output of the crank is very spiky and of course cannot show left/right leg imbalances, but thus is the nature of left sided PMs. Across the entire plot though the averages matched up and I did not see any drift over time. Satisfied with that I began playing with the zero offset from the 4iiii app, which does work nicely in either direction, and luckily for me the zero setting on mine was the closest match to my Kickr’s output. All in all I could not be happier with the purchase and the product itself. I love using the metrics of power to pace and push my indoor training and now I’ve found a reliable way to take it on the road! Buy it and enjoy!

    • Power Meter City

      Power Meter City

      HI jpipkens. Nice job! Wow! We are glad you are enjoying your 4iiii PRECISION Shimano Ultegra R8000 Power Meter. Good luck on your future rides – we hope you continue to enjoy them and please let us know if there is anything else we can do!

  10. Avatar

    Kris J (verified owner)

    This is an excellent power meter. Took 5 minutes to install and link with head unit. That’s it. Works exactly how it should.

    • Power Meter City

      Power Meter City

      Wow! Thanks for this Kris. We hope you continue to enjoy your 4iiii power meter and we are here if there is anything else we can do!

  11. Avatar

    Chuck P (verified owner)

    Doing a new build and since I have a 4iiii Precision power meter on my other bike (b-day present last year) that has been flawless, why fix what ain’t broke? Very fast shipping from Power Meter City. Easy peasy installation and pairing to my head unit (Wahoo ROAM with associated iPhone app). The only learning curve was figuring out you can’t pair two power meters at the same time on the 4iiii app. Minor inconvenience, but not a big deal. But it does mean having to unpair one power meter and re-pair the other whenever I switch riding bikes. Otherwise, the 4iiii Precision power meter works as advertised, i.e., it tells me how much I suck. 🙂

    • Power Meter City

      Power Meter City

      Hi Chuck. Thanks for this! Good choice BTW. We hope you continue to enjoy your new 4iiii PRECISION Shimano Ultegra R8000 Power Meter. We are here if there is anything else we can help you with!

  12. Avatar

    joel mclarry (verified owner)

    Power meter works great with wahoo bolt. No issues, power drops or spikes. Very easy install that took 5 minutes.

    • Power Meter City

      Power Meter City

      Hi Joel. Thanks for leaving a great review on your 4iiii PRECISION Shimano Ultegra R8000 Power Meter. We hope you continue to enjoy them and we are here if there is anything else we can do!

  13. Avatar

    Fazlee

    Excellent product! Flawless pairing to my Garmin Edge 530 and Forerunner 945. Comes packaged very nicely. I don’t use the 4iiii app for much, but for updating the firmware of the power meter, it worked effortlessly on the first try. Power meter installs easily of course, just the standard 2 bolt interface for Hollowtech II cranksets.

    The item was shipped out the same day I placed the order (maybe even within the hour!) and I received it a week later (thanks pandemic + elections shutting down the local mail office).

    Happy purchase, happy result, and I will definitely return here the next time I purchase a power meter (which will likely be soon now that my wife has seen what this does…)

    • Power Meter City

      Power Meter City

      Hi Fazlee. Looks like you are enjoy your new 4iiii power meter! Good choice BTW. Good luck on your future rides and we are here if there is anything else we can do.

  14. Avatar

    Dave Fishman (verified owner)

    Love the power meter has opened up a different way to train. And train more accurately. Power Meter City delivers great service at an affordable price. Was going to purchase earlier but they were out of stock. Had them add me to email list when available. Got notified purchased the meter and was delivered on time. Thanks for the great service.

    • Power Meter City

      Power Meter City

      Hi Dave. Looks like you are enjoying your new 4iiii PRECISION Shimano Ultegra R8000 Power Meter. We want to thank you for being a great customer! Let us know if there is anything else we can help you with!

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