?Specifically For Kids?: Each bike equipped with sealed bearing for smooth pedaling. Training wheels come with 14/16/18 inch bikes, making it easy to maintain balance and learn to pedal even for young beginners. Every CXWXC bike seat is both easily adjustable and easy to lock down. You can adjust the height to fit your kid as they grow up with the bike. The chain guard fully enclosed well protects the chain, and your child will not get hurt when try to touch the chain.