A growing devonic bicycle grows along with the baby. It is designed for children with a height of 85 to 115 centimeters, which corresponds to the age of 1.5 to 6 years. The new unique variable frame system allows you to fold up to 12 variants of balance bike and 3 of the bicycle with pedals. The increase in the horizontal distance between handlebars and seat is up to 15 centimeters. This bike replaces up to 3 conventional bikes that a child at this age needs, thus significantly reducing costs and energy for production and distribution. The bicycle frame is easily industrially manufactured.