Favero Assioma DUO: Rechargeable, Dual-Sided, and Reliable

The Favero Assioma DUO has been the reference pedal-based power meter since its launch. The combination of dual-sided measurement, rechargeable batteries, USB charging, and ±1% claimed accuracy explains why WorldTour teams and amateur racers alike have standardized on the platform. Eighteen months of training and racing produced consistent, reliable data and zero battery anxiety.

Favero is a small Italian company that broke into the power-meter market in 2018 with a rechargeable pedal design. The Assioma DUO is the dual-sided version; a single-sided PRO MX-1 version is also available. The design has been refined across three hardware generations and is now considered the benchmark for pedal-based power.

Key Specifications

• Dual-sided power measurement (left and right independently)
• Left-right balance and torque effectiveness metrics
• Claimed accuracy: ±1%
• Rechargeable Li-ion battery (50h claimed per charge)
• Magnetic USB charging (no charging port to wear out)
• ANT+ and Bluetooth LE
• IPX7 water resistance
• Look Keo-compatible (Assioma DUO); SPD-SL-compatible (Assioma DUO SH)
• 151g per pair (excluding cleats)
• User-serviceable cartridge bearings

Build & Design

The Assioma DUO pedals look and feel like a standard Look Keo pedal from the outside. The strain gauges and electronics are sealed inside the pedal body, with the charging contacts integrated into the end of the pedal spindle. A magnetic USB charging cable snaps onto the spindle end and charges both pedals simultaneously via a Y-cable.

The lack of a separate charging port is a thoughtful design choice. Sealed charging contacts cannot leak, cannot corrode, and cannot break. The pedals are also user-serviceable: the cartridge bearings can be replaced without sending the pedals back to Favero, which extends the practical lifespan to 5+ years.

The pedal body uses a stainless steel platform with a composite center, similar to a Look Keo Blade. The cleat engagement is positive and predictable; riders transitioning from non-power Keo pedals will find the engagement identical. Q-factor is 64mm (versus 60mm on standard Keo), which is slightly wider; riders with hip issues may want to test before committing.

Real-world Testing

Eighteen months of training and racing on the Assioma DUO produced consistent, reliable data. Real-world battery life tracked at 45-50 hours per charge, on par with the 50-hour claim. Charging from empty to full took roughly 2.5 hours. The magnetic USB charging cable is the smallest, most portable charger of any power-meter pedal on the market; carrying the Y-cable and a small USB power bank provides weeks of cord-free riding.

Comparison against a Quarq DZero crank-based power meter showed the Assioma DUO within 3-5 watts at threshold efforts and within 1-2 watts at steady-state tempo. Left-right balance data was consistent across repeated measurements to within 0.5%. Auto-zero calibration worked seamlessly; the pedals re-zero on every spin-up without manual intervention.

Power phase and platform center offset data was consistent with the Quarq reference across sprint efforts. The Assioma DUO delivers the same cycling-dynamics metrics as crank-based systems, with the added convenience of pedal-portability.

One limitation worth noting: the Look Keo only compatibility. Riders on SPD-SL must buy the Assioma DUO SH (SPD-SL-compatible) at a $50-100 price premium. Riders on Speedplay must look elsewhere. The Favero product line does not cover every cleat system, but the Look Keo and SPD-SL versions cover the majority of road cyclists.

Pros

• Dual-sided measurement with left-right balance
• Rechargeable with magnetic USB (no port to fail)
• Easy to transfer between bikes (5-minute pedal swap)
• User-serviceable cartridge bearings
• Proven accuracy in independent testing
• 5+ year practical lifespan

Cons

• Premium price ($899 USD at launch)
• Slightly heavier than crank-based systems
• Look Keo only (SPD-SL riders need the SH version at extra cost)
• Q-factor is 64mm (versus 60mm on standard Keo) — wider
• Battery cannot be replaced in the field (factory service required)

Verdict

The Favero Assioma DUO remains the best pedal-based power meter on the market. The rechargeable design, dual-sided measurement, and proven accuracy make it the right choice for serious racers and structured-training enthusiasts. Budget-conscious riders should consider the 4iiii PRECISION 3 or the Assioma PRO MX-1 single-sided version. SPD-SL riders should consider the Wahoo POWRLINK ZERO. For Look Keo riders who want the best pedal-based power meter, the Assioma DUO is the right tool.