Quote Originally Posted by Jesden View Post
whats the highest R, do we know?
Well, there's an achievement for ranking your racing chocobo up to rank 285. If the ranks can go that high, the races presumably do as well. And while it's not exactly stated (at least anywhere I can find) that that's the rank cap, it would be an odd place to put the achievement if it isn't the cap. So I'm guessing R-285 (or a named equivalent) is going to be the top one.