Features: 21 Speed Three Speed In Front And Seven Speed In Back Double-kill disc brake system more stable and reliable Thickened shock-absorbing front fork High carbon steel material strong and reliable Comfortably cope with various road sections and has a good shock-absorbing effect. 21-speed trigger shifters and rear derailleur provide effortless gear changes when riding up an incline or speeding down a decline Specifications: 1. Product Size: 26 Inches 2. Cushion Height Adjustment Height Range: 780~990mm 3. Gear Shift: 21-Speed (Front 3 Rear 7) 4. Frame: High Carbon Steel 5. Front Fork: Shock-Absorbing Front Fork 6. Handlebars: Mountain Bike Handlebars High Carbon Steel Sand Black 620mm 7. Stem: Aluminum Alloy Stem 8. Front And Rear Brakes: Mechanical Disc Brake Aluminum Alloy 9. Roulette: High Carbon Steel 24T*34*42T 10. Shift Lever: Race Crown Shift Lever 11. Front And Rear Derailleurs: Race Crown Front And Rear Derailleurs 12. Front And Rear Hubs: Iron Hub 36H 13. Flywheel: High Carbon Steel Domest