Can be run in tricycle mode or training mode Strong steel construction supports riders up to 80lbs Installation hardware is included Fits bikes with wheels up to 20" 5th bullet text The Spotter 600 from Bell is a set of sturdy training wheels for children. Reinforced steel provides robust support for a wide range of rider weights, up to 80 pounds. The training wheels can be run in either training mode, where the wheels hover slightly above the ground and encourage rider balance by accommodating tilt, or tricycle mode, where the wheels remain planted on the ground to enhance rider stability. The brackets fit on wheels 20" and under. The Spotter 600 is a must-have for children learning to ride, because everybody has to start somewhere