Let the good times roll on the Huffy 51cm Pro Thunder Single Speed Coaster Bike. The single-speed bike with a coaster brake is easy to use and the perfect next step for your growing kid. The freedom and fun of riding a 51cm bike signals the start of new adventures with friends and unforgettable memories! Race-inspired graphics accelerate the fun for good times! Single-speed bike has durable steel frame, rear coaster brake. Liquid blue graphics on a sleek design inspire racing with friends. Railed seat has quick release clip to adjust height for the right fit.