Originally Posted by
Trakhak
The frame is no less free to twist secured in a trainer than otherwise, unless you're suggesting that tire hysteresis and spoke flexing or whatever are crucial to the effect.
Anyway, I'm hoping for a response from someone who has the academic background to evaluate the validity, or lack thereof, of such a test.
I'm suggesting that fixing the bike in the vertical plane means both the crank and wheel can't be loaded normally by weight and lean angle together.
You will measure something, but it will be different than on the road.