Unique suspension system for enhanced performance over more varied terrain. 14" drive wheels and 9" casters offer excellent maneuverability and stability. Four seat post allows for customized rehab seating capabilities. Optional: Capatain seat, angle adjustable back and flip-up armrests, and recliner lever. Standard: Rehab seat, power tilt 4?~60? for pressure relief, seat width adjustable in 18", 20" and 22".