All-terrain mobility scooters include knobby tires, robust motors, and boosted ground clearance to deal with gravel paths

https://www.4shared.com/office/ZIsbHTlSjq/pdf-94916-10874.html

All-terrain mobility scooters include knobby tires, robust motors, and enhanced ground clearance to deal with gravel paths, turf, and moderate off-road surfaces.