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

https://www.4shared.com/office/Pvwit8vyku/pdf-2274-34996.html

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