Assioma PRO RS-2 SPD-SL Power Meter

The Assioma PRO RS-2 is Favero’s latest power meter for the road – lighter, more precise, and even more versatile. With dual-sided power measurement and a sleek, modular design, the PRO RS-2 sets a new standard. The pedal is fully compatible with Shimano SPD-SL cleats – without compromising fit or feel. Weighing just 123.5 g per pedal, the PRO RS-2 is currently the lightest power meter pedal on the market. The fully sealed sensor unit is housed within the robust axle body and separated from the pedal body – ensuring maximum durability and easy maintenance.

The PRO RS-2 is the evolution of the Assioma DUO-Shi, as the measurement now takes place in the pedal axle and no longer in the transmitter. This means the RS-2 no longer has an increased Q-factor.

The PRO RS is also available as a single-sided version: PRO RS-1

Differences: PRO RS-2, PRO MX-2 and Assioma DUO

Dual-Sided Measurement

Just like the DUO, both pedals of the PRO RS-2 are equipped with sensors. This provides you with precise data on power, cadence, and left/right balance. Additionally, the PRO RS-2 transmits advanced metrics like PCO (Pedal Center Offset) and Power Phase – perfect for biomechanical analysis or bike fitting.

For beginners or budget-conscious riders who can compromise on the last percentage of accuracy, the single-sided PRO RS-1 is a good alternative.

Compatible Bike Computers and Smartphones

The PRO RS-2 transmits data via ANT+ and Bluetooth Smart. It is compatible with all common bike computers (Garmin, Wahoo, Sigma, etc.) as well as smartphones using the Favero Assioma app.

Compatible Bikes & Cleats

The PRO RS-2 is designed for use on road bikes. The included SPD-SL® compatible cleats fit shoes with a 3-bolt standard. Original Shimano® SM-SH10, SH-11, and SH-12 cleats are also compatible. Riders switching from a Shimano pedal system will benefit from identical geometry and fit – no adjustment phase needed.

Construction & Weight

Weighing just 123.5 g per pedal (including sensor and battery), the PRO RS-2 is the new lightweight champion among power meters. The ultra-low 10.5 mm stack height improves power transfer and provides a more direct pedaling feel.

Battery Life & Charging

The integrated lithium-ion batteries last over 60 hours per charge. Charging is easy with the magnetic charging cable while the pedals remain on the bike. Two magnetic connectors and one USB charging cable are included.

Modular Design

A real game-changer: the modular design allows the pedal body to be swapped – e.g., from road to MTB. The sensor unit remains intact. This reduces long-term costs and opens up entirely new use cases.

Precision & Dynamics

Thanks to the IAV Power System, the PRO RS-2 delivers accurate measurements even when using oval chainrings (±1%). An integrated gyroscope provides additional stability in data transmission – even during sprints or irregular cadence.

Setup & Updates

Setup is done via the Assioma app (iOS & Android). Firmware updates and settings such as crank length can also be configured via the app.

Installation

As simple as always: the pedals are mounted with an 8 mm Allen key – no special tools needed. Perfect for frequent riders, bike swappers, and travelers.

IAV Cycling Dynamics

With Cycling Dynamics, you gain deep insight into your pedal technique. In addition to standard power in watts, the following metrics are transmitted:

- Power Balance (left/right distribution)
- Cadence
- Torque Effectiveness (effective force on the pedal)
- Pedal Smoothness (evenness of force distribution during a pedal stroke)
- Power Phase (portion of the stroke where most power is applied)
- Rider Position (seated or standing)

Setup and Firmware Updates

Initial setup and registration require a smartphone and the Assioma app (Android, iOS). The Assioma app is also used for firmware updates. Power meter settings (e.g., crank length) can be easily configured via smartphone.

Durability & Support

The sensor unit is fully sealed and securely housed inside the axle – independent of the pedal body. This increases durability and makes maintenance or replacement even easier. Favero offers the usual 2-year warranty and excellent support, including remote diagnostics via app.