To an adult, it looks very simple. To a child, it is a machine from a different world and love at first sight. The tricycle helps develop children's motor skills. The tricycle seduces children of all ages and, in the process, trains their muscles and develops their sense of coordination and space faster than you can say "try it". Small: Seat height 28 (11") - 9kg (19lbs). Ages 2-4 Medium: Seat height 35cm (14") - 11kg (24lbs). Ages 3-6Large: Seat height 43cm (17") - 13kg (28lbs). Ages 4-8