Collection: Cycling Power Meters | Favero & Garmin

The choice between Favero Assioma and Garmin Rally primarily comes down to battery architecture, stack height, and pedal body modularity:

• Battery Architecture: Favero Assioma features 100% factory-sealed rechargeable lithium-ion batteries with magnetic USB charging connectors (50–60 hours per charge), eliminating battery caps that can strip or leak. Garmin Rally uses user-replaceable coin-cell batteries (1x CR1/3N or 2x LR44 per pedal) delivering up to 120 hours of ride time.
• Stack Height & Weight: Favero offers the lowest stack height in the industry (10.5 mm on PRO RS and Uno/Duo) and lighter overall weight (~151–158 g per pedal). Garmin Rally has a slightly taller stack height (12.2 mm road, 13.5 mm gravel) and weighs ~160–222 g per pedal.
• Pedal Body Modularity: Garmin Rally allows you to swap pedal bodies between road (SPD-SL / Look Keo) and off-road (SPD) using factory conversion kits on the same spindle. Favero Assioma systems are dedicated factory-built pedal assemblies engineered for maximum structural rigidity.

Single-Sided Power Meters (Favero Uno, PRO RS-1, Garmin Rally 100): Measure force exclusively at the left pedal spindle and double the value to calculate total wattage. This provides consistent, highly reliable training zones and threshold tracking at a lower entry price. Single-sided pedals can also be upgraded with a right-side pedal kit later.

Dual-Sided Power Meters (Favero Duo, PRO RS-2, Garmin Rally 200): Measure both legs independently with individual strain gauges. This unlocks true left/right power balance, torque effectiveness, pedal smoothness, and advanced cycling dynamics—essential for competitive racers, athletes recovering from lower-body injury, and riders diagnosing physiological imbalances.

Yes, with complete precision. Standard crank-based power meters that assume a constant rotational speed can report power errors of 1% to 4% with non-round (oval or Q-Ring) chainrings. Both Favero Assioma and Garmin Rally solve this natively:

• Favero Assioma: Integrates a 3-axis gyroscope with proprietary IAV Power (Instantaneous Angular Velocity) technology that measures the exact angular speed variation throughout every millisecond of the pedal rotation, guaranteeing true ±1.0% accuracy regardless of chainring shape.
• Garmin Rally: Employs high-frequency internal cadence sensors that calculate instantaneous angular velocity across every quadrant of the stroke to maintain ±1.0% precision with oval chainrings.

Yes. Both Favero Assioma and Garmin Rally feature universal standard 9/16″-20 pedal spindle threads that fit all alloy and carbon road, gravel, and mountain bike cranks (Shimano, SRAM, Campagnolo, Easton, Praxis, Cane Creek, Rotor).

Important Installation Note: When installing pedal power meters on carbon crank arms (or any crank with a recessed pedal eyelet), always install the included 1 mm pedal washers. This ensures the sensor spindle shoulder does not make direct frictional contact with the carbon crank face, preventing torque distortion and crank finish damage.

Threshold Cycling is an Official US Authorized Retailer for both Favero Electronics and Garmin International. When you order your power meter from us, you receive:

• Authentic Manufacturer Warranty: Full Official 2-Year Factory Warranty on all Favero Assioma products and full Garmin manufacturer factory warranty coverage.
• Direct US Shipping: All power meters ship directly from US fulfillment facilities with tracked USPS or UPS delivery (in-stock Favero meters dispatch same/next-day; Garmin Rally orders process within a standard 3–5 business day fulfillment window).
• Dedicated US Technical Support: Direct domestic customer service for setup, pairing, calibration, and warranty assistance.