Which Power Meter Fits Shimano SPD-SL Cleats?

Founder, Mr. Mamil

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).

ComparisonGarmin Rally RS200Favero Assioma Duo-Shi
Weight160 to 320g*varies**
ConnectivityANT+, BLEANT+, BLE
Battery Life120 hours50 hours
Cleat typeShimano SPD-SLShimano SPD-SL
Pedal stack13.5mmvaries***
Warranty1 year2 years
Price$1100 (dual)
$650 (left)
$659 (dual)
Power meters comparison for Shimano SPD-SL cleats

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

Garmin Rally RS200 Power Meter
Garmin Rally RS200 Power Meter

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.

Easy installationMore expensive
Maintains a similar pedal stack and Q-factor to existing Shimano pedals1-year warranty
Option for a conversion kit to Shimano SPD or Look Keo cleats
Pros and cons of Garmin Rally
More reading : Power2max NG Road vs NGeco Road Comparison

Favero Assioma Duo Shi

Favero Assioma Duo-Shi Power Meter
Favero Assioma Duo-Shi Power Meter

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.

Cheaper option compared to Garmin RallyMore complicated installation
Ability to reuse existing Shimano pedal bodyNot compatible with Shimano Dura-Ace pedal bodies
2-year warrantyLarger Q-factor (64/65mm) compared to standard Shimano pedals (52/53mm)
Pros and cons of Favero Assioma Duo-Shi
Alex Lee at Mr.Mamil

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.