A certain two-wheeler is a type of vehicle that has two wheels and is powered by an engine. The most common type of certain two-wheeler is a MOPED, which is a motorized bicycle with an engine capacity of no more than 50cc. Another type of certain two-wheeler is a CHARIOT, which is a two-wheeled vehicle pulled by horses or other animals. Finally, a Segway is a two-wheeled, self-balancing electric vehicle that is powered by batteries.