[b1lk1]

I have just under 9" of ground clearance to the lowest part of my hitch assembly. Even when my trailer is attached (and that drops me down to about 5-6" of clearance) I only scrape on sharp steep angles. Overall tire size is a function of the entire formula. I believe that the 215/75 R15 tires have the same overall diameter as the 225/60 R16.