As the others said, 205/60/15 would give you the least speedo error. However, why in the world would you want to get MXV4's? They are, IMHO, crappy tires that are WAY too expensive. If you want something sticky, go with the Yokohama AVS-I. If you want something that'll last, I recommend the BFG Comp TA HR4. I went from MXV4's (that were on the car when I bought it) to the HR4's. The HR4's were quite a bit stickier, almost as comfortable, and less than half the price ($52 each). However, it's your money.