Tricycle conversion sets or kits convert a bicycle to an upright tricycle. They both enjoy riding antique tricycles, participating in the 2014 Tricycle Cannonball Endurance Ride. A variant with three wheels is a recumbent tricycle. The Model D was a biplane fitted with a wheeled tricycle undercarriage. A tadpole tricycle has two front wheels and one rear wheel. The Whike is a recumbent tricycle with a sail, made in the Netherlands. The airframe was streamlined, and fitted with retractable tricycle undercarriage landing gear to reduce drag. It is a low-wing monoplane of conventional configuration with retractable tricycle undercarriage. It is often riding an old fashioned red tricycle. Dunlop then put pneumatics on both rear wheels of the tricycle. It was also equipped with a tricycle undercarriage arrangement. Its fixed undercarriage can be provided in either tricycle or tailwheel configuration. Pedaling a tricycle and jumping in place is acquired. It was also the first fighter fitted with a tricycle undercarriage. The tricycle undercarriage is non-retractable.