Light and Strong 6061 Aluminium Frame Shimano 3 x 7 Speeds Shifter Shimano Tourney Derailleurs SAGA Quality Suspension Fork Double-Wall Alloy Rims All-Terrain Hybrid Tyres Quick Release Wheels Kickstand Included SPECS: Frame: 14". Wheels: 24". Drivetrain: 21(3 * 7) speeds, SHIMANO shifters, derailleurs and cassette, KMC chain. Frame Material: Alloy 6061. Handlebar: Alloy 560mm wide x 6 degrees. Pedals: WELLGO polymer 9/16" bearing axle. Safety reflectors and bell included. Seat Height: 28-36 inches (73-91 cm). Kickstand Included. SUITABLE AGE GROUP: The bike with 24-inch wheels is designed for children from 8 years old to 12 years old, or 50-59 inches (127-150 cm) tall. It's perfect for riding in the parks or on the sidewalk around the neighborhood. ALL-TERRAIN FUN: 21(3*7) gears, all-terrain tires, and suspension fork work together to help kids ride up and down hills easier and more enjoyable. Mechanical disc brakes offer reliable braking performance to keep the riding safe all the time. EASY TO INSTALL: The bike is 85% assembled in the box. A set of Allen keys is included for convenience.