The Favero Assioma PRO RS-1 is the lightest single-sided road power meter pedal on the market, weighing just 123.5 g—making it ideal for road cyclists who want precision without adding extra mass. Designed specifically for Shimano SPD-SL cleats, the RS-1 delivers ±1% accuracy, long battery life, and rock-solid stability, even during sprints, high-cadence climbs, or indoor training sessions.
Favero’s innovative split-body architecture places all electronics and battery components in the sealed spindle, protecting the system from rain, pressure-washing, debris, and impacts. With IP67 waterproofing and Favero’s renowned reliability, the PRO RS-1 is engineered for real-world riding conditions—not lab-perfect scenarios.
Whether you’re training for power-based intervals, racing, or beginning structured training for the first time, the PRO RS-1 offers world-class sensing accuracy with future-proof upgradability: turn it into a full dual-sided system anytime using the RS-UP kit.
Who This Power Meter Is For
Perfect for road cyclists who:
Prefer the natural feel of Shimano SPD-SL road pedals
Want a lightweight and aerodynamic single-sided power meter
Need reliable data for climbing, intervals, and structured training
Use indoor platforms like Zwift, TrainerRoad, or Wahoo SYSTM
May upgrade later to a dual-sided power meter without replacing the entire system
Want accurate power numbers at an affordable price point
Key Benefits
Lightest Power Meter Pedal Available (123.5 g): Favero engineered the RS-1 to be the lightest SPD-SL power meter pedal, offering a natural road feel while minimizing rotational mass.
±1% Power Accuracy With IAV Technology: Unlike older systems that depend on cadence assumptions, IAV measures Instantaneous Angular Velocity, ensuring precision even with:
oval chainrings
uneven pedaling
standing climbs
high-cadence surges
Left-Only Power With True Pro-Level Metrics: The RS-1 provides more than basic power:
Cadence
Power Phase
Pedal Smoothness
Platform Center Offset (PCO)
Torque Effectiveness With ANT+ and Bluetooth, these integrate perfectly with all major bike computers.
Ultra-Durable Split-Body Architecture: Electronics hidden inside the spindle =
better crash protection
no exposed battery door
improved waterproofing
highly stable long-term accuracy
Upgradeable to Dual-Sided Power Anytime: Add the Assioma PRO RS-UP kit to instantly convert your RS-1 setup into a full RS-2 dual-sided power system — without buying a new pedal set.
60+ Hour Battery Life With Magnetic Charging: Train longer, race harder, and charge less. No fragile ports, no water ingress — just effortless magnetic charging.
Features
Single-sided left pedal power measurement
Compatible with Shimano SPD-SL cleats
±1% accuracy guaranteed with IAV
60+ hour rechargeable battery life
IP67 waterproof rating
Slim 10.5 mm stack height
Standard +53 mm Q-factor (Shimano matching)
Tracks PCO, pedal smoothness, power phase, torque effectiveness
ANT+ and Bluetooth compatibility
Modular system — upgrade to dual-sided or switch to MTB bodies
Built in Italy with pro-grade calibration and quality controls
Real-World Use Cases (Long Tail Keyword Blocks)
Road Cyclists Who Want Accurate Training Data: Ideal for threshold intervals, VO2max sessions, endurance rides, and long climbs.
Cyclists Searching for the Lightest SPD-SL Power Meter Pedal: Its low weight and aerodynamic profile make it a favorite among weight-focused riders.
Indoor Training on Zwift & TrainerRoad: Instant pairing via Bluetooth—great for winter training blocks.
Upgrade Path to Dual-Sided Later: Start with RS-1, upgrade anytime with RS-UP to unlock complete left/right analysis.
Comparison Table: RS-1 vs RS-2 (After Upgrade)
Feature
RS-1 (Single)
RS-2 with RS-UP Kit (Dual)
Power Type
Left-only
Independent left/right
Accuracy
±1%
±1%
Metrics
Power, cadence, dynamics
Advanced full dynamics
Best For
Training, beginners, indoor
Racing, data-driven analysis
Weight
123.5 g
Same
Upgrade Cost
—
Affordable upgrade
How to Install
Install the pedals like standard SPD-SL pedals.
Pair the system via the Favero Assioma app.
Set your crank length.
Zero-calibrate before first ride.
Start training with accurate power data.
Troubleshooting & Expert Tips
Re-enter crank length if switching between bikes
Use only the magnetic charger to avoid port damage
For accuracy, recalibrate after large temperature shifts
Clean and dry the pedal body after wet rides
Don’t store fully discharged—recharge periodically
Check about troubleshooting guide in more details here.
Technical Specifications
Measurement: Left-only power
Weight: 123.5 g (L), 122.5 g (R)
Cleat Type: Shimano SPD-SL
Connectivity: ANT+ & Bluetooth
Accuracy: ±1%
Battery: Rechargeable Li-ion (60+ hours)
Stack Height: 10.5 mm
Q-Factor: +53 mm
Waterproof Rating: IP67
Materials: Carbon-tech body, hardened spindle
Made in Italy
Warranty: 2 years
What’s in the Box
Magnetic charging connector
USB/USB-micro charging cable
Shimano SPD-SL compatible cleats
4 pedal washers
Greasing tool kit
Warranty & safety manual
Welcome flyer
FAQs
1. What is the Favero Assioma PRO RS-1? A lightweight, single-sided SPD-SL road power meter pedal measuring left leg power with ±1% accuracy.
2. Is it compatible with Shimano cleats? Yes — it fully supports Shimano SPD-SL cleats including SH10, SH11, and SH12.
3. Can I upgrade to dual-sided power? Absolutely. Add the PRO RS-UP kit to convert your RS-1 into the dual-sided RS-2 system instantly.
4. How long is the battery life? Over 60 hours, with magnetic charging for safe, waterproof power connections.
5. Does it support oval chainrings? Yes — IAV Power Technology ensures precise ±1% accuracy even with oval rings.
6. Is the PRO RS-1 waterproof? Yes. The sealed spindle design delivers IP67 waterproof protection.
7. Is installation difficult? No — install like any SPD-SL pedal and connect using the free Favero Assioma app.
8. Which devices is it compatible with? Garmin, Wahoo, Zwift, TrainerRoad, Rouvy, Strava, and any ANT+/Bluetooth bike computer.
9. What is the Q-factor? A standard +53 mm, matching Shimano’s natural road geometry.
10. Who is the RS-1 best suited for? Road cyclists who want a lightweight, affordable, accurate, and upgradeable power meter system.
Assioma PRO RS-1 | Single-Sided SPD-SL Power Pedal
