I am a bicycle riding instructor with a mission. I want to teach a many cyclists to change a rear flat as I can (especially women, although I will teach anyone ). I have a theory that when folks learn to change the rear flat, that the fear of the bicycle decreases (as does confidence and the freedom to not worry so much going out alone) and allows for the possibility of learning more mechanics. Just a thought. So, I wondered how many of you feel competent at changing a rear flat tire? If so, how did you learn? If not, what's in the way?