A power meter isn’t an item you purchase to receive immediate dividends in speed – as per a new set of aero wheels. However, invest and you’ll be able to train more efficiently, seeing better results in the long run.
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The 4iii 2.0 3D power meter, in this case fitted to a Shimano 105 5800 crank arm, is a single sided power meter which uses an algorithm to work out your overall power figures.
In our review, the unit got 9/10, and our tech writer concluded: “it is sufficiently accurate and consistent for most riders to gain useful information that will improve their training and therefore I can highly recommend it.”
The most startlingly impressive stat is that the whole thing adds just 9 grams to your bike.
In the Black Friday sales, you can pick one up for just £284.99, down from the RRP of £379 at ProBikeKit.
- Buy now: 4III Precision 2.0 3D Power Meter, 105 5800 Black at ProBikeKit for £284.99
- ‘Buy Now’ links explained: if you click on this then we may receive a small amount of money from the retailer if you purchase the item. This doesn’t affect the amount you pay.
The power meter uses a tri-axial strain gauge, fitted on the left crank arm, and will track both power and cadence.
It communicates to your headunit – a cycling computer or your phone – via Bluetooth or ANT+, and there’s an accompanying app to show you battery usage and the like.
The reported accuracy is as low as +/-1%, which means the power meter should be accurate against itself (not other power meters – they pretty much all give slightly different readings) which is all you need to track your own performance.
Battery life is reported at 100+ hours, and the unit takes a 2032 coin cell battery.