We have said before that weight shouldn’t be your main criteria when choosing a power meter. In our article on How to Buy a Power Meter, we classify the weight of your power meter as a Tier III item. This is because the benefits of training with power more than offset the weight added by a power meter. In addition, even the heavier power meters add maybe 200-250 grams to your bike. This isn’t more than about half a pound. Having said this…the weight of your power meter is something you should at least be aware of. Moreover, all things being equal, who doesn’t want a light power meter! So in this article, we wanted to touch on the weight of power meters in a bit more detail. We’ll also highlight the lightest power meter of all – for all you weight weenies out there!
Lightest Power Meter
When determining the weight of your power meter, it’s important to focus on added weight. For example, say you are swapping your current crank set out for a crank-based power meter. The weight of the power meter is only part of the equation. You also need to know how much your current crank set weighs. Then, by determining the difference, you know how much weight you are adding. So in our example, if the crank-based power meter you’re considering weighs 700 grams, and your current crank weighs 500 grams, the added weight is 200 grams.
Typically, crank-based power meters are the heavier power meters (SRM, Verve InfoCrank, ROTOR 2INpower, etc.). Some of these power meters can add upwards of 200-250 grams to the bike. Again, it’s worth reiterating that this isn’t even half a pound. So it’s not like these power meters are ‘heavy’ by any means. This is why we say heavier, in the relative sense.
Pedal-based power meters are somewhere in the middle. The Favero Assioma DUO, Garmin Vector 2 and PowerTap P1 weigh 299 grams, 358 grams and 398 grams (both pedals), respectively. If you compare this to some of the popular pedals on the market, you might be adding somewhere around 100 – 150 grams of weight.
On the lighter end of the spectrum you have the PowerPod Power Meter, which weighs only 65 grams including the mount (32 grams for the PowerPod and 33 grams for the mount). This is about 1/10th a pound – a very light power meter indeed.
And the Lightest Power Meter is…
However, the lightest power meter of all is the 4iiii PRECISION. The PRECISION is a left-side crank arm-based power meter available in both Shimano road and MTB versions. 4iiii takes a standard Shimano left-side crank arm and attaches a small pod (containing strain gauges, a battery and the communications device) to the inside of the crank arm. The pod weighs all of 9 grams – practically nothing. Moreover, you’re not sacrificing quality for weight either. The 4iiii boasts accuracy of +/-1%, making it one of the most accurate power meters. Lastly, starting at $399, it’s also one of the most affordable power meters. That’s a tough combination to beat!