This is mini tubbed to frame rails but with a parallel bar 4 link. Has 17 x 12 but I have enough room for a 13 easy. Tire is a MH 325/50/17 28 inch but I am going to a 390/40/17 29.5 12.5 tread width 14.30 section. I can use a 15 inch diam wheel if needed.