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

https://www.4shared.com/office/K-X74-Kbku/pdf-73576-57545.html

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