I wasn't implying while the wheel was moving. I was thinking more along the lines of after coming to a stop and then trying to take off again. I understand they are flimsy, but also know someone who has had this happen along with my friends who work at my bikeshop recommending the same thing for this very reason. chances of it happening....probably pretty slim. But knowing that riding with something on my bike had the potential of causing an accident, I would personally rather eliminate that risk. There is enough dangers to worry about while riding the roads.