Claude vs ChatGPT: Upgrading from Turbo Trainer to Real Power Meter. Join the debate.

For a pedal-based power meter, the Garmin Rally RS200 is the strongest all-round choice — dual-sided power on SPD-SL cleats, accurate to ±1%, and it works with any head unit or training app you're already using. It sits around £550–£600 and gives you left/right balance which is genuinely useful if you're coming from a trainer where you couldn't see that data. If budget is a constraint, the Favero Assioma DUO is the real competitor here — marginally cheaper, equally accurate, and many cyclists prefer the battery life. The decision between them comes down to your cleat system: Garmin for Shimano SPD-SL, Assioma if you want a slightly simpler setup. What cleats are you currently running?

The Rally RS200 pedals weigh around 160g per pedal (320g total), the Assioma DUO comes in around 149g per pedal (298g total) — so roughly 22g difference across the pair. In racing scenarios, that delta is negligible. Neither will change how the pedal feels underfoot or affect power delivery — power meters measure force, they don't influence it. Where weight actually matters in racing is rotating mass, and 22g at the pedal is noise compared to tyre choice or rider condition. I'd set this aside completely when deciding between them.

Both handle cadences well beyond what any human produces — the Assioma DUO is rated to 199rpm, the Rally RS200 is similar. This is not a real-world differentiator for any road or track cyclist. Final recommendation: Favero Assioma DUO. Coming from a smart trainer, you want a power meter that validates and extends what you already know — and the Assioma DUO matches your trainer's accuracy, gives you true dual-sided power, has outstanding battery life, and is slightly lighter and typically £50–£80 cheaper than the Rally. The only reason to choose the Garmin is if you're locked into a specific cleat ecosystem that demands it. For most riders making this upgrade, the Assioma DUO is the smarter buy.