KYMCO VIVIO 4MPH RWD ELECTRIC TRANSPORTBALE FOLDABLE WHEELCHAIR POWERCHAIR. Vehicle Class Powerchair. TOP SPEED: 4 MPH. WHEELCHAIR / SCOOTER,THAT ALL THE ELECTRONICS,MOTORS AND. With 14" drive wheels and a low-impact kerb climber, this chair can tackle kerbs up to 100mm, at low speeds and even from a standing start.