larges tires front and rear 15" on 73 duster

195/65/15 on a 15x7 wheel w/ 3 1/2 backspace, no rub. bottom is a 275/60/15 on a 15x10 w/ a 3 1/2 backspace, and a 15 x 4 with a 145r15 .but i am about to ditch it all for 15x6 and 15x8 steels all the way around going for a more tame look