Polygon and Marin kids bikes are bicycles for kids of age 6 to 12 years old with designs available for both boys and girls. Polygon kids bikes come with all parts scaled down to fit smaller bodies, not simply the frame. By changing the cranks, pedal, wheels, handlebars and gears. Kids mountain bikes, kids dirt bikes, kids BMX bikes, 20 inch kids bikes, 24 inch kids bikes are various bikes available for kids. Kids bikes are available in Bicycles Online with delivery all over Australia.