I want to mount a 7.50x16 tires on my flatty. I planned on using the factory 16x4.5" wide rims, but the guy at the tire shop said I should have atleast a 5" wide wheel. I know the Army used the 7.50 tire on their desert Jeeps and I think they were still using the 16x4.5" rim. I don't think that half an inch will really make that big of a difference but I could be wrong. Thanks for the help.