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4iiii PRECISION Power Meter For Shimano Ultegra 6800

josh December 18, 2018
4.67 out of 5 based on 3 customer ratings
(3 customer reviews)

$499.99 $375.00

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 For Shimano Ultegra 6800
  • 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

3 reviews for 4iiii PRECISION Power Meter For Shimano Ultegra 6800

  1. 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. 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. 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.

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