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4iiii PRECISION Power Meter For Shimano 105 5800

josh November 14, 2018
5.00 out of 5 based on 8 customer ratings
(8 customer reviews)

$399.99 $360.00

The world’s lightest and most affordable, ready to ride direct force power meter

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4iiii PRECISION Power Meter For Shimano 105 5800

Used by the World Pro Etixx-Quick-Step Team, the 4iiii PRECISION Power Meter for Shimano 105 5800 is the lightest, most affordable, ready to ride direct force power meter available. The added weight of the power meter is only 9 grams and it is accurate to within +/- 1.0%.

The 4iiii PRECISION Power Meter for Shimano 105 5800 is a left-only crank arm-based power meter and replaces your current left side crank arm. The power meter takes the power that is generated by your left leg and doubles it in order to determine your total power output.

In addition to being affordable, lightweight and highly accurate, the 4iiii PRECISION measures precise cadence data, has 3D power meter technology capable of measuring tri-axial strain and is compatible with both ANT+ and Bluetooth SMART devices.



Most Affordable DFPM

At only $399, the 4iiii PRECISION Power Meter for Shimano 105 5800 is the most affordable, ready to ride direct force power meter available.

High Level of Accuracy

The PRECISION is accurate to within +/- 1%. This compares to average accuracy of +/- 1.5-2% for most other power meters.

Lightest Power Meter

At only 9 grams (the weight of the 4iiii pod), the PRECISION is the lightest power meter you can buy!

Easy to Install

Because the PRECISION is a left-side crank arm power meter, 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.

Bluetooth SMART

In addition to ANT+, the PRECISION also transmits data via the Bluetooth SMART wireless protocol. This means it is compatible with any bicycle computer, smart phone or tablet using these protocols.


Crank arm lengths: 165 mm | 170 mm | 172.5 mm | 175 mm



The 4iiii PRECISION Power Meter is compatible with all Shimano Hollowtech II road cranks.


In the Box

  • 4iiii PRECISION Power Meter for Shimano 105 5800
  • 2 2032 coin cell batteries
  • Quick Start guide



Name4iiii PRECISION Shimano 105 5800
Bike TypeRoad
Location of Power MeasurementCrank Arm
Left or Both Legs MeasuredLeft only
Independent Left/Right MeasurementNo
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Weight9 grams (added weight)
Battery TypeCR2032 coin cell
Battery Life100 hours
Method of Cadence MeasurementAccelerometer
Warranty1 year

8 reviews for 4iiii PRECISION Power Meter For Shimano 105 5800

  1. Rated 5 out of 5

    Vishnu Lochan

    The residual effects that transfer through the Crank of the 105 has finally gotten itself ‘Amperage Value’. With the ‘4iiii Precision Power Meter’ meeting the threshold of measuring the resistance force of gravity contingent upon the exerted force of its Rider through Time and Space to avail the quotient of Power; keeping pace with ‘Watts’ is now reality. Yes!

    • Power Meter City

      Power Meter City

      Hi Vishnu, Sounds like you like your 4iiii PRECISION Power Meter For Shimano 105 5800! Let us know if we can be of any further assistance. 🙂

  2. Rated 5 out of 5

    Carlos Vieira (verified owner)

    Great value. Performs very well, easy to calibrate when start riding, doesn’t require mid ride calibration (unless temp variation is above 50C), add almost no weight to your bike and so far has not presented any signal loss with my garmin edge.

    Can’t really comment on accuracy as I would need to have others PMs running in parallel to compare, but general consensus on websites and foruns is that the 4iiii pm is very accurate and on par with stages.

    • Power Meter City

      Power Meter City

      Hi Carlos, Well you did a pretty good job of summarizing all the reasons we like it too! We have performed some accuracy tests against SRM and Verve and the 4iiii is right there indeed. Enjoy your new power meter!

  3. Rated 5 out of 5

    Alexander (verified owner)

    Possibly the best value in a single sided power meter. Paired up with my Garmin 520 on the first attempt and haven’t had any issues with it.
    I would also like to add that customer service through Josh has been first rate in dealing with a backorder situation.

    • Power Meter City

      Power Meter City

      Hi Alexander, Thank you for the review! Yes, the 4iiii power meter is pretty awesome. Affordable, easy to set up and it just works! Let us know if you need anything else. Thank you

  4. Rated 5 out of 5

    Robert Schwiebert (verified owner)

    I’ve owned this meter for 3 months now. During those 3 months it has seen 4 training sessions each week. I’ve mostly used it paired to TrainerRoad which uses BlueTooth 4.0 (aka Smart) as opposed to ANT+. It’s been one of those products you purchase and don’t really think much about after a few rides with it because it “just works”. I’ve never had an issue with it pairing to my computer and that’s with a bunch of other 2.4GgHz signals floating around in my house too (Wi-Fi, BT sound bar, wireless keyboard, etc…). The nice thing with TrainerRoad is that now I’m able to use the PowerMatch feature to insure my Kickr Snap power reading and target is accurate and is in line with the power I can generate outside in the real world.

    I also did a small test comparing this to my Stages power meter on my mountain bike using a custom workout I created for my smart trainer. It steps through different power targets ranging from 100W to 800W. I made sure to use the same tire, pressure, and that everything was calibrated correctly. The 4iiii tracked practically identical to the Stages. The only difference was when compared to my Kickr Snap and only at very low wattages. Both the Stages and 4iiii read equally high compared to the trainer but it’s more likely the trainer was reading low.

    Now that it’s getting nicer out, I’ve been transitioning intervals to outdoors. I’ve used it paired to my Garmin Edge 520 (ANT+) and the experience has been flawless. Never a dropped signal, consistent calibrations, and once again it “just works”. It’s seen mostly dry weather but there was a road trip where it spent 4+ hours on top of my car at highway speeds in the rain. When I got to my destination I removed the battery cover to check for moisture and it was dry as a bone.

    I’ve updated the firmware once using the 4iiii app and my Android phone (Google Pixel). Very straightforward and painless.

    Overall I’m beyond pleased with my purchase. It’s amazing what you get for the price without any compromises. If I had to get another power meter, 4iiii is the clear choice.

    • Power Meter City

      Power Meter City

      Hi Robert. Great review! Sounds like you’re putting your 4iiii PRECISION Power Meter For Shimano 105 5800 to good use…that’s what we like to see! Let us know if there is anything else we can do.

  5. Rated 5 out of 5

    Angus Voo Lok Hyen (verified owner)

    My 2nd power meter from Power Meter City. A simple and value power meter with no wear and tear component. Power reading is very consistent.

    • Power Meter City

      Power Meter City

      Hi Angus. Thanks for the review and for your business! Yes…the 4iiii power meter is a great unit and makes life pretty easy. For $399, it’s tough to beat really. Let us know if there is anything else we can do!

  6. Rated 5 out of 5

    Warren (verified owner)

    Probably the best bang for you buck when it comes to power meters. I’ve now purchased two for two different bikes and highly recommend this left-side crank arm power meter.
    I was pleasantly surprised with how quickly the meter arrived, safe and sound.

    • Power Meter City

      Power Meter City

      Hi Warren. Thank you for the review. We agree…the 4iiii PRECISION Power Meter For Shimano 105 5800 is tough to beat! Let us know if there is anything else we can help with.

  7. Rated 5 out of 5

    Marciano (verified owner)

    Switched from a Powerpod to this. As usual customer service was fantastic. That’s the same thing I would say about the 4iiii precision. Paired up with the 520 without any problem. Calibrated in seconds and ready to ride. Hasn’t skipped a beat since installation. I cant really think of a better value with a single sided direct force meter. Happy that I was able to buy this.

    • Power Meter City

      Power Meter City

      Hi Marciano. Thanks for the review. We agree, for $399, the PRECISION 105 5800 is an awesome value. Glad it’s working out for you. Let us know if there is anything else we can do!

  8. Rated 5 out of 5

    Steve (verified owner)

    This review is as much about Power Meter City as it is about the 4iiii PRECISION Power Meter For Shimano 105 5800. I had originally ordered the Velocomp PowerPod Lite. For $179 (after new customer discount) I thought it would be a great way to get into the world of Power Meters. Long story short, I just could not get it calibrated. The Velocomp team was great with Customer Service and really tried to help but it eventually got to the point where I just didn’t trust the data – not a good place to be. I had the unit for about 45 days or so and thought I’d be stuck with it, however, PMC has a 60 day return policy. People, this is unheard of and they really honor it. I sent the Pod back for a full refund and got this beauty instead. More than I originally wanted to spend, but at $369 I can now say it was well worth the money. My wattages look much more ‘normal’ and transmit to my Edge 520 nearly instantaneously. I already feel that it has helped my riding! Also, I have an older 105 groupset (from 2015) and this works just fine. Many thanks to the team at Power Meter City!

    • Power Meter City

      Power Meter City

      Hi Steve. Thanks for the great review. It’s our pleasure to help out and we’re glad you have a PM you enjoy. Happy training!

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