In the competitive world of cycling power meters, Favero’s latest offering—the Assioma Pro RS—raises the bar for pedal-based measurement. Designed for road cyclists who demand both precision and versatility, these pedals integrate full electronic components within a Shimano SPD-SL-compatible spindle, delivering dual-sided measurements and a comprehensive suite of cycling dynamics. This comprehensive review examines the Pro RS’s technical specifications, unboxing and installation process, real-world performance data, and overall value proposition.
Product Introduction and Technical Specifications
Favero, the renowned Italian power meter manufacturer, has evolved the Assioma series with the Pro RS (Road Shimano) pedals. Available in three configurations—RS2 dual-sided, RS1 single-sided, and the RS-UP upgrade kit—these pedals embed all electronic components inside Favero’s proprietary spindle design, ensuring no compromise in Q-factor or stack height.
Key Technical Specifications
- Compatibility: SPD-SL cleat system, full Shimano road shoe compatibility
- Weight: Under 124g per pedal (dual-sided set under 250g)
- Accuracy: Factory-calibrated to ±1% with active temperature compensation
- Battery Life: Up to 60 hours continuous operation via rechargeable lithium-ion
- Charging: Magnetic USB-C connector (no proprietary chargers needed)
- Connectivity: ANT+ and Bluetooth Smart
- Q-Factor: Standard 53mm
- Stack Height: 10.5mm
- Maximum Rider Weight: 120kg (264 lbs)
Advanced Data Metrics
The Pro RS delivers comprehensive cycling dynamics through Favero’s Instantaneous Angular Velocity (IAV) technology:
- Power and cadence measurement
- Left/right balance (RS2 dual-sided)
- Power phase analysis
- Platform center offset (PCO)
- Torque efficiency
- Pedal smoothness
- Rider position detection
Pricing and Configurations
| Model | EUR Price | USD Price | AUD Price | Configuration |
|---|---|---|---|---|
| Pro RS2 | €789 | ~$850 | ~$1,300 | Dual-sided |
| Pro RS1 | €578 | ~$620 | ~$980 | Single-sided |
| RS-UP Kit | €49 | ~$55 | ~$80 | Upgrade RS1→RS2 |
Unboxing and First Impressions
The retail package includes everything needed for immediate installation:
- Pro RS pedal pair
- Magnetic USB-C charging clips
- Six-degree-float yellow cleats
- Spare grease packets and bearing service tools
- Manual and warranty documentation
The pedals immediately impress with their featherlight construction and clean aesthetic. Finished in matte black with subtle red accent rings around the spindle flanges, they exhibit the quality expected from premium Italian engineering. With all electronics fully internalized, there are no exposed battery housings or protruding sensors.
Installation and Setup Process
Installation follows standard pedal procedures with some Pro RS-specific steps:
Physical Installation
- Apply thin grease layer to 9/16″ spindle threads
- Thread pedals using 15mm wrench
- Torque to 30-40 Nm
- Use included pedal washers for carbon cranksets
Electronic Activation
- Wake pedals from “travel mode” by connecting USB-C charger briefly
- Download Favero Assioma mobile app (version 4.0+)
- Pair pedals via app
- Input crank length and personal details
- Perform initial zero-offset calibration
On head units like the Garmin Edge 1050, the pedals appear as “Assioma Pro RS2” with full battery status, firmware version, and calibration data readily accessible.
Real-World Performance Testing
Over three months of extensive testing across road, gravel, and indoor environments, the Pro RS pedals demonstrated exceptional accuracy and reliability when compared against reference standards including SRM PM9 crank-arm power meters and Tacx Neo 3 trainers.
Accuracy Validation
Sprint Performance
- Peak sprint test: Pro RS 1227W vs. SRM PM9 1231W (within 1%)
- Consistency: No “sticky watts” or lag in power response
- Transient tracking: Excellent response to rapid power changes
Steady-State Efforts
- 20-minute threshold: Pro RS 192W vs. SRM 192W vs. Neo 3 190W
- Temperature stability: Minimal drift across varying conditions
- Calibration requirements: Initial setup only, no mid-ride adjustments needed
Left/Right Balance
- Dual-sided accuracy: 95.9% vs. 4.1% split corroborated by reference meters
- Dynamic tracking: Real-time balance shifts during different riding positions
Connectivity Performance
- Multi-device pairing: Stable simultaneous connection to smartphone and bike computer
- No dropouts: Reliable data transmission even in dense Bluetooth environments
- Smart trainer integration: Seamless ANT+ FE-C compatibility for ERG-mode workouts
- Zwift integration: Full cycling dynamics displayed in real-time on training platforms
Advanced Cycling Dynamics in Action
The Pro RS’s comprehensive data suite provides insights previously available only in laboratory settings:
- Power Phase: Visual representation of effective power delivery throughout pedal stroke
- Platform Center Offset: Shows where force is applied on the pedal platform
- Torque Efficiency: Measures how effectively applied force translates to forward motion
- Rider Position: Automatically detects seated vs. standing efforts
During testing, standing efforts showed power phase shifts from approximately 90° to lower angles as cadence and biomechanics changed—data that enables targeted technique refinement.
User Experience and Maintenance
Pedal Engagement
The SPD-SL interface performs flawlessly across all tension settings:
- Easy entry: Engagement requires only leg weight at lowest tension
- Secure retention: Maximum tension (28/28) prevents accidental releases during sprints
- Float comfort: Six degrees of cleat float prevents knee strain
Maintenance Requirements
Like all pedals, the Pro RS requires periodic servicing:
- Bearing service: Every 500-1,000 hours under typical road use
- Tool inclusion: Favero provides grease and service tools
- User-serviceable: Pedal bodies removable for bearing inspection/re-greasing
- Weather resistance: Sealed design handles rain, mud, and salt exposure
Competitive Positioning
At €789 for the dual-sided RS2, the Pro RS sits competitively in the premium pedal power meter segment:
Weight Advantage
- vs. Shimano Dura-Ace PD-R9200: ~124g vs. ~248g per pedal
- vs. Previous Assioma Duo: ~124g vs. ~303g per pedal
Feature Advantage
- Comprehensive cycling dynamics
- Dual-sided measurement standard
- Temperature compensation
- 60-hour battery life
- USB-C charging convenience
Who Should Consider the Pro RS?
The Favero Assioma Pro RS appeals to several cyclist categories:
- Performance-focused riders seeking comprehensive power data
- Multi-bike owners wanting easy power meter portability
- Weight-conscious cyclists prioritizing minimal mass addition
- Training enthusiasts interested in advanced biomechanical insights
- Tech-savvy riders wanting seamless smart trainer integration
Final Verdict
The Favero Assioma Pro RS pedals represent a significant advancement in pedal-based power measurement technology. By successfully integrating comprehensive electronics within a lightweight, standard-geometry platform, Favero has created a system that truly doesn’t compromise.
Standout Strengths
- Exceptional accuracy: ±1% performance validated against reference standards
- Minimal weight penalty: Under 124g per pedal
- No fit compromise: Standard Q-factor and stack height
- Comprehensive data: Professional-grade cycling dynamics
- User-friendly operation: Simple installation and maintenance
- Future-proof connectivity: USB-C charging and modern wireless protocols
Minor Considerations
- Requires periodic bearing maintenance like all pedals
- Premium pricing reflects advanced feature set
- SPD-SL compatibility only (road-specific)
For riders prioritizing accuracy, comprehensive data, and minimal installation complexity, the Assioma Pro RS pedals deliver on all fronts. They successfully bridge the gap between laboratory-grade measurement tools and practical cycling equipment, empowering riders to optimize both training and technique.
In an era where marginal gains matter, the Pro RS doesn’t just measure power—it provides the insights needed to find those crucial performance improvements. Whether you’re chasing personal records, optimizing training efficiency, or simply seeking to understand your pedaling mechanics, these pedals represent a worthy investment in your cycling performance.
Excellent comprehensive review! I’ve been waiting for someone to do thorough real-world testing against SRM and Tacx. The fact that you got within 1% accuracy across sprint and steady-state efforts is impressive. I’m currently using single-sided Stages and the left/right balance data from the RS2 is really appealing. That USB-C charging is a nice touch too – no more proprietary cables when traveling. Definitely considering the upgrade!
As someone who has both a dedicated trainer bike and multiple road bikes, the portability factor is huge for me. The installation process you described sounds much simpler than my current Quarq setup. I’m particularly interested in the platform center offset data – I’ve suspected my pedaling technique could use work and having that real-time feedback during Zwift sessions would be invaluable. The pricing seems reasonable too, especially with the upgrade kit option.
This review just convinced me to make the jump to power-based training! I’ve been hesitant because of the complexity and cost, but the Pro RS seems to solve both issues. The fact that they include all the service tools and make maintenance user-friendly is a big plus. I love that it’s only 124g per pedal – that’s lighter than some of my regular pedals! The IAV cycling dynamics sound fascinating too. Starting with the RS1 and upgrading later seems like a smart approach.
Great detailed review! I’m a cycling coach and have been recommending Favero products to my athletes for years. The Pro RS looks like a significant step up from the previous generation. The temperature compensation feature is particularly important for athletes training in varying climates. I’m excited about the torque efficiency and pedal smoothness metrics – these will be invaluable for technique analysis with my riders. The fact that it pairs seamlessly with Garmin devices is crucial for my workflow.
Outstanding review – this is the level of detail I was hoping to find! I’ve been torn between these and the Garmin Rally pedals, but your comparison data really helps. The weight difference is substantial (124g vs 200g), and the fact that you didn’t experience any connectivity dropouts is reassuring. I race criteriums where every watt matters, so that ±1% accuracy validated against SRM gives me confidence. The 60-hour battery life is also a game-changer for stage races. Placing my order this week!