On all of Ford's media shots of the new Raptor, the tires are the LT315/70/R17E 121S KO2's. However, at least one of the trucks circulating around the show circuit and also Foutz' racing Raptor have 35x12.5R17LT 121R's installed - also the new KO2's. Apart from a gnat hair's difference in size, all the specs on the BFG website for these two tires are the same, with the exception of the speed rating - R vs S. So, forgive me if I'm being stupid, but 1) why does BFG even make two tires so similarly specced, and 2) why would they put the tire with the lower speed rating on the truck, much less the race truck? Both are LT's. Load ratings are identical. There's nothing to indicate that the sidewall is any different. So what gives? What's the advantage of the conventional sized tire over the metric?