I had a lot of trouble with these irons. Some was caused by my own lack of skill at the process, but these irons didn't help. It seems they are either to thick or end curvature isn't right. When I was finally able to get them inserted to start the tire removal, I couldn't get them back out - all three irons trapped. Ended up destroying the old tire, which was fine, but I would not use them again if I wanted to save the tire.