Claude vs ChatGPT: Best Power Meter for Triathletes UK. Join the debate.

For a two-bike setup, the Garmin Rally RS200 pedal-based power meter is the strongest choice — you swap the pedals between bikes in under two minutes, you get dual-sided power, and it reads cadence. SPD-SL cleats mean it works on any road or TT setup without adapter headaches. The main alternative is the Favero Assioma Duo, which is similarly swappable and slightly cheaper, with excellent accuracy. I'd lean Garmin if you're already in the Garmin ecosystem; Favero if you want to save £100 and don't need the pedal dynamics data. Both beat crank-based options for a two-bike athlete because you're paying once, not twice.

Fair challenge. The Assioma Duo actually has the edge on durability for frequent swappers — the pod design is more robust against the repeated torque stress of installation and removal, and the charging port seal has proven reliable in wet conditions. Garmin Rally pods are solid but have more reported instances of pod loosening over time with heavy swapping use. Maintenance-wise, Assioma wins again — rechargeable via USB-C, no battery swaps. Garmin Rally runs on AAA batteries, which is fine but adds a maintenance step. For a triathlete swapping bikes regularly, this actually tips my recommendation toward the Favero Assioma Duo. Better durability under exactly the use case in question, lower maintenance burden, and the accuracy is identical at ±1%.

The weight difference is real but marginal — Assioma Duo sits around 150g per pedal, Rally RS200 around 163g. On a TT bike chasing watts, you'll never feel that delta during a race effort. Where size matters more is TT position — the Assioma pod sits laterally and has occasionally caught attention for Q-factor feel in an aggressive aero tuck, but no meaningful performance impact has been demonstrated in testing. Final recommendation: Favero Assioma Duo. For a triathlete running two bikes, it wins on every axis that actually matters in this situation — easier swapping, more durable under repeated installation, USB-C charging with no battery faff, and identical power accuracy to the Garmin at a lower price. The weight and size differences don't move the needle. Buy once, use across both bikes, race with confidence.