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

https://mill-wiki.win/index.php/7_Helpful_Tricks_To_Making_The_Most_Out_Of_Your_Mobility_Scooter

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