FWD requires fewer parts, is less complicated, and is cheaper. For this reason it’s used in most cars.
But motorbikes turn differently to cars that makes them unsuitable for FWD. In a car you turn the wheels to move the car. But in a bike you can lean as well as turn the handlebars. But if you had a chain between the engine and the front wheel that would make turning the handlebars difficult.
Latest Answers