3-in-1 Auto-Freewheel pedal,brake coast. Tri-wheel steering Kettrike navigator system. 5 position Quik-Adjust easy step through S-frame design. 4 Position Ergonomic adjustable seat. Limited turn radius steering device and low center of gravity to help prevent tipping. Pneumatic Komfy-Ride tubless airtires on ball bearings. Easy tipping and removable rear bucket. Tandem adaptable.