ok i got some rims which are 17's but i dont kno if the width of it is for sure 8 inches wide or 7.5 inches wide?? the tire size is 205/40ZR17...what does this mean my width would or could be for the rims?? and if my tires are 205/40ZR/17, do you think it will rub if i lower 1.5 inches??