Reviews over the

4iiii Precision Ultegra 6800

By far the cheapest price for the power meter I could find, persuaded me to fit in to the second bike! Power meter is spot on, Easy to fit, and connects and calibrates in seconds. Now to put it too good use for winter training!

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Great piece of kit easy to install and set up. Works perfectly and a great price to boot. Thanks Mantel

Having previously trained off heart rate I decided to take the leap to incorporate power into my training and wanted something lightweight and cost-effective (opting to spend more of my budget on aerodynamics and training). Single sided crank arm power meters are generally the cheapest, lightest and easiest to install; and 4iiii are the cheapest - but just as good - of the main manufacturers of these (Pioneer and Stages are the alternatives). Since my bike has Ultegra R8000 I was going to simply buy an R8000 left crank power meter. However, after a bit of research I discovered that the R6800 left crank is almost identical to the R8000: the finish is almost identical; they weigh the same but the two clamp screws have been swapped around (just to be ‘different’ as far as I can tell). So in performance terms there is nothing between them. This made the purchase even better value. (A 105 left crank would also fit - saving even more pennies. I didn’t fancy mixing my Ultegra groupset with 105 - but worth considering.) All in all I’m extremely happy with this product - and the price and delivery on Mantel was good too

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Easy to use website, fast and efficient service, great product that was packaged extremely well and delivered in perfect condition very quickly. The 4iii is a great power crank, well constructed, easy set up, and comes with a spare battery. Done several rides now with it and my training is transformed. Setting strava PRs every ride now. Fantastic product.

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Absolute bargain at this price. Pretty much tracks my power from my turbo perfectly. More than happy with this purchase. Will always consider Mantel for purchases in the future.

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Excellent service and price. Easy to fit and works without problem.

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Delivery on time. Please note that this power meter is not compatible with some bikes with rear brake located below the crank what happened in my case. I didn't use the return service because I sold it. Website with excellent products and great prices. I recommend mantel.com

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Obviously well made and so simple to fit and operate. Excellent service again from Mantel.

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Even if you are not a tech minded person,it is really that easy to set up,very accurate reading aswell,the cheapest I could find anywhere aswell.

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Great power meter. The only downside is that it only measures left side and doubles it. However, it is simple to set a correction factor to account for left/right imbalance. Once the correction factor is set the overall power is very accurate giving very similar readings to my spider mounted power meter

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The product came exactly as advertised in all original packaging, it was delivered fast and the delivery company were easy to communicate with. Great shopping experience will definitely be visiting again.

Its my second 4iiii power meter after my first one went faulty. I have to say its easy to use and fit but also extremely good value for money in comparison to other products. The App is intuitive and simple, connectivity is very simple and the feedback for your training via a third party software is great. It has really revolutionised my cycling at what is really a professional level product. Given professional teams use it at World tour level it cannot be bad. The highest accolade i can give is that although i had one break on me i bought another to replace it.

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