A handcycle is either an arm powered (AP), arm-trunk powered (ATP) or kneeling position (HK), three wheels vehicle with an open frame of tubular construction, which conforms to the general principles of UCI construction for bicycles, except that the chassis frame tubes need not be straight and that for the seat or backrest construction, the maximum frame tube diameter may exceed the maximum defined by the general principles of UCI.
The single wheel may be of a different diameter to the double wheels. The front wheel, or wheels, shall be steerable; the single wheel, at the front either front or rear, shall be driven through a system comprising handgrips and a chain.
The handcycle shall be propelled solely, through a chainset and conventional cycle drive train, of crank arms, chainwheels, chain and gears, with handgrips replacing foot pedals. It shall be propelled from the hands, arms and upper body mainly.
(text modified on 01.02.09; 01.07.10; 01.02.17)