It is a very poor design by Triumph. I have a friend that owns a tire store. I get him to change mine, with the understanding that I won't complain if they scratch or even break the wheel. He and a helper get it done, and even though he doesn't want anything for doing it, I stuff a $20 in his pocket. It usually takes 2 people, some cursing and lot's of tire soap. For the young guy that does it while whistling, I'd like to know what make model tire machine he uses.