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

https://www.scribd.com/document/1059765072/There-s-A-Good-And-Bad-About-Cheapest-Mobility-Scooters-128366

All-terrain mobility scooters include knobby tires, robust motors, and improved ground clearance to tackle gravel paths, turf, and mild off-road surfaces.