Fluid trainers provide a consistent amount of resistance around the pedal stroke, and that resistance ramps up rapidly as speed/inertia increases. There is less inertia on most indoor trainers, which means that dead spots in your power stroke that you might have due to an injury become noticeable. A wheel off trainer in your biggest gear, say 50:11 might be better, but Erg mode is slower to respond with big gears and high inertia.
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