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

https://www.4shared.com/office/j_4kNFqnge/pdf-10735-7912.html

All-terrain mobility scooters add knobby tires, robust motors, and enhanced ground clearance to take on gravel paths, turf, and moderate off-road surfaces.