All-terrain mobility scooters add knobby tires, robust motors, and boosted ground clearance to take on gravel paths

https://www.4shared.com/office/Vgggkdpgku/pdf-29824-46310.html

All-terrain mobility scooters include knobby tires, robust motors, and boosted ground clearance to deal with gravel courses, yard, and mild off-road surfaces.