Huffy Green Machine RT 20-Inch 3-Wheel Tricycle in Green and Black When it's time for outrageous fun, you want the Huffy Green Machine RT. The twin-tube frame is motocross-styled and ready to produce heart-pounding 180-degree spins and smooth slides. Dual-stick steering is easy to maneuver with comfortable green grips. The Huffy Green Machine RT features a coaster brake and freewheel combination for maximum control of spins and slides. Super-slick rear wheels with green trim support the fun while the front pneumatic tire with green sidewalls adds extra power. The durable steel frame features a fully adjustable bucket seat. It's easy to make sure the legendary ride is a comfortable fit for a range of riders.