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4iiii Precision 2.0 3D Power Meter - Ultegra 6800


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Average connection time 25 secs

Average connection time 25 secs

Riding with a power meter is a sure-fire way to train more efficiently, ride faster and boost your performance. While previously, power meters remained the reserve of the professional peloton, thanks to the new 4iiii Precision 2.0 3D, training with power is more accessible than ever before. Unlike other, bulkier units, this power meter weighs just 9 grams and fits so neatly onto the inside of a regular Ultegra 6800 crank arm, you'll barely notice it's there.

Using 3D patented technology, the 4iiii Precision 2.0 3D measures your power output to +/- 1% accuracy, via the tri-axel strain gauge. With this degree of accuracy, you can train with more consistency and ultimately, achieve much better results. Powered by an easily replaceable 2032 coin-cell battery, this unit offers over 100 hours of riding time and, like a rechargeable battery, can easily be checked for life using the dedicated 4iiii companion app. Thankfully, the 4iiii Precision 2.0 3D is compatible with ANT+ and Bluetooth capable devices and apps. So, whatever computer, training device or apps you use, you won't need to worry about integration between your new power meter and your current set up.

  • 3D power meter technology (patent pending) measures tri-axial strain on your crank arm
  • Accurate, consistent data accurate to +/- 1%
  • Compact design
  • Weight: 9 grams
  • 100+ riding hours on 2032 coin cell battery
  • Battery status indicator via 4iiii app
  • Compatible with ANT+, Bluetooth Smart head units, smartphones, and other 4iiii products
  • User-friendly app and configurable rider compensation scale factor
  • Easy setup and maintenance

To ensure your frame has sufficient clearance for this power meter, please check this guide before purchase

  • Precision 2.0 3D
  • Road
  • Shimano
  • 4iiii

How long will it take to arrive?

Please check the stock availability notice on your item when placing your order. This item is:

How will I know it has been sent

You will receive an email to confirm when your item has been sent.

You can also check the status of your order and individual items by accessing your account details and following the prompts.

Please allow 10 working days from the shipping date of your order before notifying us of any late deliveries.

It may be advisable to check with your neighbors to see if your delivery has been left with them, check any places it could be left such as: garage, porch, or behind garbage cans if it was too big to fit through your mailbox. Contact your local post office to see if the item has been returned to the depot as undelivered and awaiting collection.

If I'm not completely happy with my item?

Please see our returns policy.

Customer Reviews

Overall Rating : 4.76 / 5 (21 Reviews)
  • 16 5 star reviews
  • 5 4 star reviews
  • 0 3 star reviews
  • 0 2 star reviews
  • 0 1 star reviews
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Top Customer Reviews

Where reviews refer to foods or cosmetic products, results may vary from person to person. Customer reviews are independent and do not represent the views of The Hut Group.

Precision Power meter

as the title precision tells the value of it. it was a good buy in this platform.

I like

Seems to work well. Pretty similar results to caculated average results for a ride from Strava. Simple installation (replace crank arm) and price is very good via PBK

Power Meter

Works really well. Good right out of the box, just have to calibrate it and off we go.

Great for the price

This is the second one I've owned. The first one ran perfectly for about three years and then started giving funky high readings. Advantages are: Great battery life, good design for battery compartment (waterproof), temperature compensation, signal to head unit never fails. Easy to pair. It is single sided so it just doubles the left leg. But it allows you to perfectly gauge your efforts since you really only need to compare yourself to yourself and a singlecsidecsuffices for that. I have owned Stages units too. I like these better because less susceptible to water, easier to install battery ( Stages o ring easy to lose) and more robust signal to head unit. I can't compare to other types of PMs. I can see even recreational riders can improve their riding with a PM.

4III Power Meter

The 4III Precision 2.0 3D power meter has worked flawlessly for me. I have had no issues in rain intrusion or with the battery life in the 275km of use so far. The power meter zero's with no issue and transmits data to the wahoo app on my android phone. Overall I'm very happy with the power meter especially at the price point here on PROBIKEKIT.

4iiii ultegra 6800 175mm

Excellent price value. Delivery is fast, 3 days to Hungary. The power meter is quick to install, and works well with garmin headunits and bluetooth android applications. The item in it was only 48% in condition, I had to replace it, but they gave another in the package. Recommended category who wants to train at a good price based on performance.

Power meter

Very satisfied with Probikekit, Quick delivery, best price on the market . For the 4iii power meter shimano ultegra left arm; all I had to do is attache the crank arm to the crank and the connection to my cateye pardons SMART + was immediately ready.. I grandly recommende Probikekit for there service! Laurie


Everything works great. I am still using into it.

Simply works

Easy to install and easy to pair with the Garmin. Works straight out of the box. So far have ridden the unit 5 times and power readings were consistent without and drop in the readings.

4iiii Simply Works

Great price on a 4iiii Ultegra left crank arm power meter. Easy to install and pair with a Wahoo Bolt. Simple, quick pre-ride calibrations. Consistent readings on tarmac and gravel. Smallest and lightest sensor of all left crank arm power meters. If you want basic power data during and after your rides, this product is hard to beat.