Shamino R-550 wheels came with my bike. I've tried 3 different tire manuf on them and while some are easier than others all three proved somewhere between difficult and impossible to mount and unmount. One tire I had to literally cut off with scissors. That was one of the reasons I replaced the wheels. I don't need to spend a half hour on a bike ride wrestling with a tire. Needless to say two of the remaining tires mounted easily on my new Velocity Areohead wheels. One of them didn't even need a touch of an iron.