The Smooth Radius fender is a no-nonsense, classically-styled fender that looks at home on any chopper, bobber or custom motorcycle. The Smooth Radius fender contours the rear tire nicely on 16" and 18" rear rims. They are heavy-duty, .063" (a bit thicker than 16 gauge) steel, ready to take whatever you can throw at it. These fenders have a decent sidewall on them, which works well for mounting fender struts or custom sissy bars.