If you’re using Shimano SPD-SL (road) cleats, you’ve two pedal-based power meter options. They’re compatible with all three cleat floats; red (0º), blue (2º), and yellow (6º).
| Comparison | Garmin Rally RS200 | Favero Assioma Duo-Shi |
|---|---|---|
| Accuracy | ±1% | ±1% |
| Weight | 160 to 320g* | varies** |
| Connectivity | ANT+, BLE | ANT+, BLE |
| Battery | LR44/SR44 | Rechargeable |
| Battery Life | 120 hours | 50 hours |
| Cleat type | Shimano SPD-SL | Shimano SPD-SL |
| Pedal stack | 13.5mm | varies*** |
| Q-factor | 53mm | 64/65mm**** |
| Warranty | 1 year | 2 years |
| Price | $1100 (dual) $650 (left) | $659 (dual) |
Notes :
- * Weight – Garmin Rally RS200 (320g), Rally RS100 (160g).
- ** Weight depends on the Shimano pedal body used. The spindles weigh 198g/pair and 314g/pair when used with a Shimano R8000 pedal body.
- *** Pedal stack depends on the Shimano pedal body used.
- **** Q-factor – 65mm (Shimano R8000/R6800), 64mm (R550/R540).
Garmin Rally RS100, RS200
The most straightforward option is the Garmin Rally RS100 (left-sided) or RS200 (dual-sided). It’s the successor the Garmin’s first pedal-based power meter, the Garmin Vector.
With the Garmin Rally, you’ll directly swap your existing Shimano pedals with these. Although the RS100 is a left-sided power meter, it comes with a standard pedal for the right side.
The Garmin measures left/right balance and have a ±1% accuracy.
| Pros | Cons |
|---|---|
| Easy installation | More expensive |
| Maintains a similar pedal stack and Q-factor to existing Shimano pedals | 1-year warranty |
| Option for a conversion kit to Shimano SPD or Look Keo cleats |
More reading : Power2max NG Road vs NGeco Road Comparison
Favero Assioma Duo Shi
The Favero Assioma Duo Shi is sold as a pedal spindle only, with the power meter unit. They’re available in dual-sided only.
You’ll need to install a Shimano pedal body onto the spindle by removing them from the existing pedal.
The compatible Shimano pedal bodies are;
- PD-R8000 (Ultegra)
- PD-6800 (Ultegra)
- PD-R7000 (105)
- PD-R550
- PD-R540
Shimano Dura-Ace pedal bodies are not compatible.
| Pros | Cons |
|---|---|
| Cheaper option compared to Garmin Rally | More complicated installation |
| Ability to reuse existing Shimano pedal body | Not compatible with Shimano Dura-Ace pedal bodies |
| 2-year warranty | Larger Q-factor (64/65mm) compared to standard Shimano pedals (52/53mm) |
Alex Lee is the founder and editor-at-large of Mr. Mamil. Coming from a professional engineering background, he breaks down technical cycling nuances into an easy-to-understand and digestible format here.
He has been riding road bikes actively for the past 12 years and started racing competitively in the senior category during the summer recently.