A motorcycle with two wheels in the back is commonly referred to as a "trike" or a "three-wheeler." Trikes are motorcycles that have been modified or purpose-built with an additional wheel in the rear, providing increased stability and balance compared to traditional two-wheeled motorcycles. The two wheels at the back can be arranged in various configurations, such as side by side or in a tandem (one behind the other) layout. Trikes are popular among riders who may have difficulty balancing on a two-wheeled motorcycle or for those seeking a different riding experience.