Bike Rassine Hill Kicker Pro Street Adult Trike (20-Inch), White, 50x29x34-Inch 20-inch big wheel with freewheel hub for easy coasting Standard 1 1/8 inch mountain bike stem system for easy upgrades Adjustable seat and handlebars fit a wide range of riders Ultra-thick HDPE rear wheel with sealed bearings drifts with ease Protective guard rail on top of rear frame