Bloomingdale: AHRMA Road Race. 1st Event of the AHRMA Road Race 2012 Season. Friday Practice and AHRMA Race School, racing Saturday and Sunday. The American Historic Racing Motorcycle Association Ltd. is a not-for-profit organization dedicated to restoring and competing on classic motorcycles. With about 4,000 members, AHRMA is the largest vintage racing group in North America and one of the biggest in the world. The association has grown steadily over the years, reflecting the increasing interest in classic bikes.