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

https://www.4shared.com/office/EC-14eGHjq/pdf-89634-67973.html

All-terrain mobility scooters include knobby tires, robust motors, and boosted ground clearance to take on gravel courses, grass, and moderate off-road surface areas.