Favero Assioma PRO RS-2 SPD-SL Power Meter

The Favero Assioma PRO RS-2 is a dual-sided high-end power meter for road riders using Shimano SPD-SL. Both pedals measure independently, delivering precise data for power, balance, and deeper pedalling analysis. If you want a more affordable entry point, the Assioma PRO RS-1 is the direct alternative.

The PRO spindle technology sits fully inside the axle and avoids the disadvantages of older conversion-based solutions. If you prefer Look KEO instead of Shimano SPD-SL, the Assioma PRO RL-2 is the equivalent sister model for a different cleat system.

Why the PRO RS-2 is attractive for Shimano riders

The decisive advantage of the RS-2 is not just measurement accuracy, but how cleanly it integrates into an existing Shimano setup. Riders already using SPD-SL do not need to change cleat standards or adapt their fit. That makes the RS-2 especially relevant for riders who want precise power measurement without changing a proven road setup.

Dual-sided measurement and analysis

Both pedals measure independently. This allows total power, left-right balance, and additional pedalling data to be analysed more accurately than with single-sided systems. For bike fitting, rehabilitation, sprint analysis, and ambitious training, that is a real advantage rather than a marketing feature.

Compatible bike computers and smartphones

The PRO RS-2 transmits data via ANT+ and Bluetooth Smart. It works with common head units from Garmin, Wahoo, Hammerhead, Sigma, and other brands and can also be paired with smartphones and training apps.

Compatible bikes and cleats

The PRO RS-2 is clearly designed for road and triathlon bikes. It is compatible with Shimano SPD-SL cleats and matching Shimano plates. Riders already using Shimano road pedals get a power meter without changing their pedal ecosystem.

Construction, stack height, and ride feel

At 123.5 g per pedal and only 10.5 mm stack height, the PRO RS-2 is one of the lightest and flattest power meter pedals on the market. This is not just a numbers argument: the pedal feels direct, stack remains low, and the rider's existing biomechanics change very little.

Battery life and charging

Up to 160 hours of runtime makes a noticeable difference in training use compared with older pedal power meters. Charging is done via a magnetic connector directly on the mounted pedal. That reduces friction and makes multi-bike use more practical.

Modular design

The pedal body can be replaced while the measuring unit remains the same. That is strategically useful because the real investment lies in the measurement hardware rather than the outer pedal shell. Riders who later want a different use case can keep the platform flexible.

Accuracy with oval chainrings

The IAV Power System remains accurate even with oval chainrings. This matters especially under high force, sprints, and irregular cadence, where many systems become less stable.

IAV Cycling Dynamics

The PRO RS-2 supports Power Balance, Cadence, Torque Effectiveness, Pedal Smoothness, Power Phase, and PCO (Pedal Center Offset). Riders who want to analyse stance, pressure point, and symmetry in detail get much more information here than with classic entry-level power meters.

Setup and firmware updates

Activation is done via the Favero Assioma app for iOS and Android. The app is also used for firmware updates and settings such as crank length. Functionally, it does exactly what it needs to do.

Installation

Installation is done with a pedal wrench or 15 mm open-end wrench. No special tools are required. For frequent riders and bike switchers, this is a practical advantage over many crank-based solutions.

Durability and support

The sealed measuring unit is protected inside the spindle and independent from the pedal body. This improves long-term durability and simplifies service handling. Favero provides a 2-year warranty and support that is generally regarded as practical and fast.