The Roadster 4 is a 4-wheel mobility scooter that comes with many great features. This scooter can travel up to six (6) miles between charges and has a maximum speed of four (4) miles per hour. The advantage of 4 wheel design is the added stability while moving, but also the increased turning radius (43.5″/110 cm). The non-marking puncture proof tires means you’ll never be left stranded with a flat tire. The scooter has a two and half (2.5) inch ground clearance.