Originally Posted by
merlinextraligh
I don't think that's correct. Is your wheel sliding laterally as you pedal down the road?
the friction between the tire and the road is holding the wheel in place laterally. So the flex between the bb and the rear axle is going to
essentially the same on the road or on the trainer.
Not really, you're not taking into consideration flex in the wheel itself nor the body of the tire. Not a factor in a fore/aft direction but laterally certainly not easily possible in a trainer where it does exist on the road.