Knowing how they usually do things, I'll bet 3 wheelers WILL run at the same time as the pros, ams and age/skill classes(all at the same time- it's a big track). I'm honestly waiting to see if I can take some vacation time to do this race-we're super busy at work. Also IDK how well I feel physically and am not sure I'll be able to hang on for the entire race and yes I mean just the short supermoto races. Getting old sucks! A pretty stock will do ok against the 450's if the rider is up to it. You prob won't win, but you will have fun. I have always wanted to do it(the xc) on a ATC, but mine is nowhere even close to running right now.