The Nakamura Adventure B (12") kids' bike comes equipped with tool-less removable training wheels. When your child is ready to try riding a two-wheeler, the training wheels can be easily removed by pressing two buttons and sliding them out from the mount bracket without the use of any tools. If your child is feeling a little less confident simply reverse the procedure and the training wheels are back on until they are ready to try again. This 12” bike is typically for kids between the age of 2 and 4, or 32” to 39” tall. When purchasing a bicycle for your kid, it is important to choose the right size. Your choice should be made considering the size fit, not only the age of your child. In-store sales assistants will help you to make the right choice.