The MH designation on motorcycle tires stands for "maximum hauling." This means that the tire is designed to provide maximum carrying capacity and durability. The MH designation is typically seen on touring and cruiser-type motorcycles. These tires are usually wider than standard passenger car tires, and they often have a more aggressive tread pattern to provide good traction in all weather conditions. If you're looking for a tire that can handle the extra weight of a fully loaded touring bike, then an MH-rated tire is a good option.