Grow with Kids: The NEO Kid's Mountain Bike is great for first-time riders. Comes with detachable training wheels, a height-adjustable saddle, this kids bicycle can meet the needs of your child at different stages and grow with them. JOYSTAR NEO 16 inch bike is suitable for 4-7 years (41-53 inch) kids. 20 inch bike with training wheels is suitable for 7 + years (53-63 inch) kids; the sleek stylish frame with vibrant colors, the rugged 20-inch tires make this single speed bike ready for real riding adventures.