MotoAmerica Preseason Testing At Thunderhill Raceway Park Teams begin preparation for April 21-23 series opener at Circuit of The Americas MotoAmerica teams begin preparation for April 21-23 series opener at Circuit of The Americas with preseason testing at Thunderhill Raceway Park. MotoAmerica Preseason Testing At Thunderhill Raceway Park (image) Teams begin preparation for April 21-23 […]