👉 A carthorse is a type of bicycle wheel that is designed to be used with a carriage or cart. It has two wheels, one at each end, and it's typically made from steel or aluminum, depending on its intended use. Carthorses are commonly used in rural areas where there are few other transportation options, such as walking or riding horseback. They can also be used to carry heavy loads or supplies that cannot be transported by人力車 (car) or horse-drawn carriage