Favero Assioma Duo vs Garmin Rally RS200: Which Power Meter Pedals Should You Buy?

Pedal-based power meters are the easiest way to add power data to almost any bike without swapping a crankset, and the Favero Assioma Duo and Garmin Rally RS200 are the two most recommended dual-sided options for triathletes who move between a road bike and a TT bike.

Key Specifications

  • Favero Assioma Duo — dual-sided strain gauges, IAV (Instantaneous Angular Velocity) accuracy algorithm claimed ±1%, 50-hour battery life via magnetic charger, dual ANT+ and Bluetooth Smart broadcast, 305g for the pair.
  • Garmin Rally RS200 — SPD-SL compatible dual-sided power meter pedals, £679.99 on Tredz (RRP £869.99), integrates natively with Garmin head units and watches for cycling dynamics data.

Price and Value

This is where the comparison is most one-sided: the Assioma Duo undercuts the Rally RS200 by a meaningful margin while still measuring both legs independently, which is the main reason it’s become one of the most recommended entry points into dual-sided power. At £679.99 (RRP £869.99), the Rally RS200 is a genuine premium purchase — you’re paying for Garmin ecosystem integration as much as the power data itself.

Ecosystem and Compatibility

If you already train and race on Garmin head units and watches, the Rally RS200 pairs natively and surfaces cycling dynamics metrics the Assioma Duo doesn’t. The Assioma Duo’s advantage is broadcasting over both ANT+ and Bluetooth Smart simultaneously, so it pairs with a bike computer and a smart trainer app at the same time regardless of brand — useful if your setup mixes Garmin, Wahoo and Zwift-style platforms rather than staying inside one ecosystem.

Check Favero Assioma Duo price on Amazon

Check Garmin Rally RS200 price on Tredz

Which Should You Buy?

For most triathletes wanting real dual-sided power data without committing to a full ecosystem or a crank-based system, the Assioma Duo is the more cost-effective way in, and it moves between a road bike and a TT bike in minutes with a pedal wrench and a spare set of cleats. If you’re already deep in the Garmin ecosystem and want cycling dynamics data alongside power, the Rally RS200’s integration is worth the premium — just budget for pedal wrench access, since neither of these is a five-minute swap if you’re not used to changing pedals.

Buying Tips

  • Both require compatible cleats — check you have the right cleat system before ordering.
  • Keep the Assioma Duo’s magnetic charging cable somewhere you won’t lose it between race weekends — it’s a small, easy-to-misplace part.
  • If you move pedals between two bikes regularly, budget time for a proper zero-offset calibration on each swap.

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