Ooooops!!! That will also give you a tread width of 8.2 inches. To get a 6" tread width you have to go all the way down to a 205/75R15 27.3 heightand 5.9 wide or a 215/75R15 at 27.9 height and 6.1 wide, and those will definatly not help with you gear ratio problem
