Don't know how active the supermotard forum is, and I did a lot of searching. Thought I might get a quick answer here. I know some manufacturers make sport/street tires (no knobbies) for 21" front and 18" rear, but do I have to worry about rim width. The front is a 1.6 and the rear is a 2.15. Everyone here should know what I will go through if I call up the local dealer and ask about street tires in stock for my dirt bike rims. Thanks in advance for any help.