Skip to main content

4iiii PRECISION Power Meter For Shimano Ultegra 6800

Josh Matthew April 19, 2019
4.88 out of 5 based on 8 customer ratings
(8 customer reviews)

$499.99 $299.99

The PRECISION for Shimano Ultegra 6800: Affordable, accurate and lightweight

Clear selection


4iiii PRECISION Power Meter For Shimano Ultegra 6800

Used by World Pro teams Quick-Step Cycling and BORA – hansgrohe, the 4iiii PRECISION Power Meter for Shimano Ultegra 6800 is the lightest, most affordable direct force power meter available. The 4iiii PRECISION power meter is accurate to within +/- 1.0%. In addition, it adds a mere 9 grams of weight to your crank arm. The 4iiii is a left side crank arm-based power meter and 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.



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
  • 2 2032 coin cell batteries
  • Quick Start guide



Name4iiii PRECISION Ultegra 6800
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 Ultegra 6800

  1. Avatar
    Rated 5 out of 5

    Ivan Murdock (verified owner)

    Reliable and repeatable. This is a great product.

    • Power Meter City

      Power Meter City

      Hi Ivan, That’s what we like to hear! Enjoy it!

  2. Avatar
    Rated 4 out of 5

    Doug (verified owner)

    I have used the 4iii power meter for just over a month now. I have been very happy with its ease of setup, price and accuracy. Now back to interval training!

    • Power Meter City

      Power Meter City

      Hi Doug, Thanks for the review and go crush those intervals! We’re here if you need anything.

  3. Avatar
    Rated 5 out of 5

    ari (verified owner)

    Bought this product when I visited US for a week, powermetercity delivered it fast without any trouble.
    the 4iiii itself has been great so far (2 weeks usage with some rain included), though it is left side only PM, the reading is comparable with my old garmin vector (dual side power meter) where they mostly resulted in single digit watts difference of average power and more importantly, it is consistent enough (though, I have not test it on high enough elevation/mountain). Now, I mostly use the 4iiii only, this way I can switch to lighter pedal and get rid of the Vector pods.

    • Power Meter City

      Power Meter City

      Hi Ari, Great to hear the 4iiii PRECISION Ultegra power meter is working out for you. It really is a great power meter and we too have found them to be super reliable and consistent. Enjoy it and let us know if you need anything else.

  4. Avatar
    Rated 5 out of 5

    Mohd Herwan (verified owner)

    Great product. Have been used more than a month, working really great

    • Power Meter City

      Power Meter City

      Hi Mohd. Thanks for the review. The 4iiii crank arms are some of our most popular units. I’m glad it’s working out for you!

  5. Avatar
    Rated 5 out of 5

    Bryan (verified owner)

    Have been using my 4iiii Precision PM for three months now, through all sorts of late fall and wet winter riding and so far it’s been flawless. This was my first purchase from Power Meter City and I was very happy with the speed of order fulfillment and shipping. Will definitely be looking at 4iiii and PMC for my next purchase!

    • Power Meter City

      Power Meter City

      Hi Bryan. Thanks for the review. I’m happy to hear your 4iiii power meter is delivering the goods! Keep up the good work and let us know if there is anything else we can help you with!

  6. Avatar
    Rated 5 out of 5

    Brett Chapman (verified owner)

    Bought from PMCity while visiting the US from New Zealand back in October 2018. I have a Stages power meter (1st Gen) which has worked fine apart from having to remove the battery each ride but couldn’t go past the 4iiii for price. I have to say that it has worked flawlessly for me and I can only speak positively about its reliability and performance from day 1. My Stages has been relegated to my training bike.

    • Power Meter City

      Power Meter City

      Hi Brett. Thanks for the review. Glad to hear the 4iiii 6800 is working well for you. Come back and visit us anytime!

  7. Avatar
    Rated 5 out of 5

    sakari uunila (verified owner)

    excellent product. some trouble synching with Polar bike computers, which are compatible, but other than that, it is working very well. Using it with my polar v800 watch also and works well. Would highly recommend.

    • Power Meter City

      Power Meter City

      Hi Sakari. Thanks for leaving us a review on your 4iiii PRECISION Shimano Ultegra 6800. Keep up the good work!

  8. Avatar
    Rated 5 out of 5

    Alexander Ortiz (verified owner)

    After a few month of riding the 4IIII PRECISION POWER METER FOR SHIMANO ULTEGRA 6800 has been working reliably and consistently giving me great power numbers. Battery life is excellent. I had an issue with Cadence numbers spiking every now and again so I reached out to the customer support. Wriley reached out to me and addressed every concern I had including an analysis of my ride through fit files.I can’t complain about the support. It’s great when a product manufacture is responsive and helpful and works with it’s customer.

    • Power Meter City

      Power Meter City

      Hi Alexander. Thanks for the great review of your 4iiii. We’re glad you got everything sorted and hope you continue to enjoy it. Please let us know if there is anything else we can do!

Add a review

Shopping Cart