Black Friday deals: 4iii Power Meter crank for £284.99

Give your training a makeover with a great value power meter

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.

>>> How to train with a power meter

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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.

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.