Yet again, this is an occasion where the "JETZcorp Universal Race Standards Plan" (JURSP) would save the day. Have your three standard 125, 250, and 500cc classes with all the rules in place to keep things difficult (manual transmission, no electronic aids, etc) but then also have the total unlimited crazy insanity prototype class, with no rules on the technology except that it's got to have two wheels. Humanity will discover the fastest way to go off-road on a bike under this system. Or, they'll discover teleportation, either way, it'll be bad-ass. Yay for JURSP!