Favero Assioma Duo Review

Most power meter decisions are a tangle of trade-offs. The Assioma Duo is notable for how few it asks you to make. It measures power in the pedals, which is the location that gives you the two things upgrading riders value most — easy installation and free movement between bikes — and it does the fundamentals so well that it's become the quiet default recommendation across the category. This review walks through what it is, who should buy it, and the handful of riders who'd be better served elsewhere.

What it is

The Assioma Duo is a pair of dual-sided power meter pedals. The measurement electronics live in a pod on the spindle of each pedal, so both your left and right legs are read independently and you get a true left/right balance figure rather than a doubled estimate. Favero claims ±1% accuracy — the same tier as the flagship pedal and spider meters from Garmin and Wahoo. It uses a Look Keo-compatible cleat, and Favero includes cleats in the box.

Installation and living with it

This is where the Assioma quietly wins. Because the meter is the pedal, installation is the same as fitting any pedal — thread it into the crank arm with a pedal wrench, and you're done. There's no torque-sensitive crank swap, no chainring compatibility to check, no bonding a gauge to a specific arm. When you want the meter on a different bike — a winter trainer bike, a travel bike, a new frame — you unbolt it and move it in a few minutes. That portability is the single biggest practical reason to choose a pedal meter, and it's the theme of our best power meter pedals roundup.

Day to day, the rechargeable battery is the other quiet luxury. A magnetic clip charges both pods, and a charge lasts long enough that you'll settle into a rhythm rather than thinking about it. There are no coin cells to keep in a drawer or hunt for mid-training-block — the trade being that a flat battery on a trip needs the charger, not a corner store.

Accuracy and data

Favero claims ±1%, which puts the Duo in the top accuracy tier alongside the priciest pedal and spider meters. For the way most riders train, though, the more important quality is repeatability — reading the same watts for the same effort, ride after ride — and the Assioma has built its reputation on being consistent. If you want the fuller argument on why the absolute accuracy figure matters less than people assume, our smart trainer vs power meter guide gets into it.

Being dual-sided, the Duo also reports true left/right balance, which is the main thing it offers over the single-sided Uno. That data is genuinely useful if you're rehabbing an imbalance or working on pedaling efficiency, and merely interesting for everyone else. It broadcasts over both Bluetooth and ANT+, so it pairs with Zwift, your bike computer and every major training app — and indoors it can serve as your primary power source for numbers that match your outdoor rides.

Who it's for

The Assioma Duo is for the rider adding power who wants one meter to serve every bike, values a rechargeable battery over coin cells, and rides — or is happy to ride — a Look Keo-style cleat. If that's you, this is close to a no-brainer, and it's why it wins the top spot in our roundup. We explain how we reach that judgment, without a test lab, on our how we review page.

Alternatives worth a look

Garmin Rally (RS/RK): the pick if you want to stay on Shimano SPD-SL or genuine Look Keo cleats, with deeper Cycling Dynamics data on a Garmin head unit — at a higher price and on coin cells. Favero Assioma Uno: the same claimed ±1% and portability, single-sided, for less money, with a clean path to become a Duo later — the full head-to-head is in our Duo vs Uno comparison. 4iiii Precision 3+:the cheapest way into power if you only ride one bike and don't need the meter to move or read both legs. If you're still weighing whether a power meter belongs ahead of other upgrades in your setup, start with do I need a smart trainer.