In the years since Grand Prix racing’s premier class shifted from two- to four-stroke motorcycles, four ex-Superbike racers—Troy Bayliss, Nicky Hayden, Ben Spies, and Cal Crutchlow—have stood on the top step of a MotoGP podium, their eight combined victories a small percentage of the actual number of races run during that period. “In the past, you had good examples with the Americans or the Australians,” Repsol Honda Team Manager Alberto Puig said on Friday at Circuit of The Americas. “For whatever reason, times have changed. It’s difficult to understand a country like the US that in the 1980s was [in the Grand Prix paddock]. Now it isn’t. When I think about it, I don’t find an answer.” Today’s path to MotoGP is paved, as it has been for some time, through well-organized feeder programs, the long-standing 125cc and 250cc two-strokes replaced years ago by four-stroke Moto3 and Moto2 classes. Joe Roberts, riding for the Dutch RW Racing GP squad, is the lone American in the paddock. The 20-year-old Californian has no Superbike experience.