Ontario motorcycle plates are typically 7 inches in width and 4 inches in height, conforming to the standard size for motorcycle license plates in the province. These plates are smaller than regular vehicle plates, designed to fit the smaller dimensions of motorcycles while still displaying the necessary information such as the alphanumeric code unique to each plate. This sizing ensures visibility and adherence to provincial regulations regarding license plate dimensions for motorcycles, facilitating easy identification by law enforcement and other road users.