I've never felt judged by any of your posts, Ekimo. Like Jo, I'm quite interested in the topic. I wouldn't want to do anything that would cause harm to my rats. But I don't want to take their wheels away without valid reasons. That's why I went looking for documented research this morning.
One thing they pounded into me in nursing school and even more so with my psych degree is to never accept anything as fact without scientific research to back it up. At this point, I'm not saying you're right or wrong - or that those of us using wheels are right or wrong. But if I panicked and refused to give anything to my rats that anyone ever said was bad or anyone had ever had an accident with...well, I pretty much wouldn't be able to have them, because there would be no cage that someone, somewhere hasn't said wasn't safe for rats, and no food that someone, somewhere hasn't said their rat choked on, and no toy that someone, somewhere hasn't said that their rat has been injured on.
My own personal experience is that my obsessive wheel running girls have never had "wheelie tail" or any spinal problems. But my own personal experience isn't scientific research, and never will be.