Boys can ride fast and furious on the Magna Throttle BMX Bike by Dynacraft. This durable BMX-style ride features a high-gloss paint finish complimented by custom graphics and black and silver details on the handlebar pad, top tube pad, and chain guard. Coaster brakes make stopping especially easy, so he will feel comfortable and in control on every ride. An adjustable seat allows the bike to grow with your little one. The 12-inch tires (and the removable/adjustable training wheels) are a great option for boys ages 3-5 years or 34-40" tall. The 16-inch tires (and the removable/adjustable training wheels) are a great option for boys ages 4-8 years. The 20-inch tires and design are a great option for boys ages 6-10 years or 48-53" tall.