Designed with 24-inch wheels, this bike fits riders ages 8 and up, or 4' 8" to 5' 6" in height. Steel mountain-style frame and front suspension fork provide a durable, reliable ride. 21-speed Revoshift twist shifters and Shimano rear derailleur offer a wide gear range and quick shifts. Front and rear linear pull brake combine to deliver reliable all-condition stopping. Light and strong alloy rims add durability without weighing you down. Knobby tread mountain tires are designed for the trail. Alloy mountain crank means less pesky maintenance on your end. Tool-free adjustable seat post makes it easy to find a comfortable fit. Includes limited lifetime warranty for as long as you own the bike.