Looking for some radial front tires for my 32 highboy. I have 15 by 4 inch wide rims. Can get some 165-80-15, but really hate to use a Chinese tire, and can't find a USA made tire that size. Firestone sells a 195-65-15 that would look nice, but they suggest a 5 inch wide rim. What happens, if I mount them on a 4 inch rim? TIA