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

https://wiki-triod.win/index.php/4_Dirty_Little_Secrets_About_The_Mobility_Scooter_Companies_Industry

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