Hey Im looking at buying a set for black FR500 rims for my 99 cobra. They are 18x9 up front and 18x10 backs. I was just wondering what the best tire size would be since the rear times they come with are bald. American muscle reccomends 305/35/18, my brother has 275,45,17s on his. I was wondering if theres much difference between the stock 45s and the reccommend 35s.