?STURDY FRAME?This all-terrain mountain bike uses carbon steel frame and internal buried brake cables, which can greatly improve ride safety. ?Great Braking System?Disc brakes allow for more precise and controlled, are more effective than rim brakes, help to keep safer when riding at high speeds, down slopes and in wet conditions. ?21-Speed Gear System?This bike is equipped with a 21-speed system, featuring a 3-speed front derailleur and a 7-speed rear derailleur, offering versatility for various terrains. ?Thick Shock-Absorbing Front Fork?This bike features a reinforced shock-absorbing front fork, providing a smoother and more comfortable ride on various terrains. ?Assembly&Size Guide?85% pre-assembled, tools included. If you have any questions about bikes, Please do not hesitate to contact us. The 24-inch bike fits 53?-66? tall kids for age 9-15.