Every time I change tires I threaten to have the shop mount them for me the next time but I did it again myself. My front tire was so tight I thought it would never come off today. I couldn't even get the tire tools between the rim and tire to get it off without lots of work. It seemed like the tires shrunk to me. I'm glad I was changing the tire out anyway because I wasn't careful in this case. On top of it I think the tube was as thick as the tire. Some kind of white powder came all out of the tire once I broke the bead.