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

https://www.4shared.com/office/OPaBGK6Bfa/pdf-39048-98576.html

All-terrain mobility scooters include knobby tires, robust motors, and boosted ground clearance to deal with gravel courses, yard, and mild off-road surface areas.