DESIGN: 3-in-1 Developmental ride on: The YBIKE Evolve will help your little ones develop early valuable motor skills and transition to a normal pedal bicycle when they are ready. Easily change the Evolve to a no-pedal two-rear wheel balance bike for initial stability and ultimately convert to a single rear wheel for a more advanced running bike. Use the Evolve to teach young children pushing, steering, coordination, and motor skills. The rubber wheels make it indoor-suitable to ride on tiles and floorboards. Made of high-quality materials, the YBIKE Evolve is durable and strong enough to use outdoors too! FEATURES: Adjustable saddle height for a more customizable fit Quick release lock on pedals helps ensure added safety Aluminum main frame offers long-term durability Composite rear stays Injected composite wheel core Rubber grips Injected molded plastic seat SPECS: Recommended for ages 2-5 Max weight: 66 lbs.