I read this article one time in a magazine, forget which one, and it was on, does size really matter? And, they compared an rmz-250, rm-250, and rmz-450, and, the lap times were extremely close, the garbage that people tell you about the 450 being so much faster, not true, it really isn't, the magazines make it sound like it is, but, I have one word for you, PROPOGANDA!