The Nakamura Brook 18" girls' bike comes equipped with removable training wheels. When your child is ready to try riding a two wheeler, the training wheels can be removed. 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 18” bike is typically for kids between the age of 5 and 8, or 40” to 47” 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.