A new champ, a brief but spectacular threat from two-stroke motorcycles and a win for a crowd favorite from Milford, Michigan, named Rex. There may have never been a more fascinating time for Class C racing than the 1975 season. At that time, the AMA’s Grand National Championship was still the most coveted of motorcycling’s crowns. Even though attrition of various sorts had eliminated several brands and made it a race between two manufacturers, Harley-Davidson and Yamaha, both companies were still willing to break the bank to get that number-one plate.