I had to exert lots of effort to mount 2 Continental GatorSkin 700x32 folding tires a couple of days ago. I was beginning to wonder if I could get them on. I don't know if it helped but I put some soapy water on the tire bead. The first bead went on easy but not the other one. Vision rims. The Kenda Valkyrie Elite tires I replaced were also tough to mount after a flat. I think the tolerances for the rims might be on the large end and the tires on the small side of the range.