I'm still thinking on the 250R vrs the 500 Ninja. My question is whether or not the 250R will accept 17" wheels and tires from another Kawasaki. I understand Moment of Inertia/gyroscopic action/technical physics...just there are many more choices with 17"tires not only with width and profile but from racing slicks/softies, to road cruisers/long lasting harder tires. Also if the 17" wheels fit what are my limitations in width/profile. I will be riding old blacktop Hiway 56 hills curves and then some older roads that used to be highways. So my preference is a lowprofile wide, and fairly soft tire. When I was riding my Suzuki 450S I was constantly dragging my footpegs after changing my tires...