1. High-density carbon steel frame：Built with high-density carbon steel, this mountain bike offers exceptional durability and strength to handle rugged trails, rocky paths, and daily commutes. The sturdy frame absorbs road vibrations while maintaining stability, ensuring a safe and comfortable ride for years to come.2.21-speed system：Equipped with a professional 21-speed gear system, this bike delivers smooth, precise shifting in any terrain. From steep climbs to fast descents, you can easily adjust the gears for optimal speed and control, making every ride efficient and enjoyable.3.Front and rear dual V-brakes：Featuring front and rear mechanical V-brakes, this bike provides powerful and responsive stopping performance in all weather conditions. Whether it's rain, mud, or dry roads, the dual V-brakes ensure safe and immediate braking, giving you peace of mind on every ride.4.Front suspension system：The front suspension fork with adjustable damping helps absorb shocks from bumps, roots, and rocks, delivering a smoother ride on rough terrains. It reduces fatigue and enhances control, allowing you to explore more challenging trails with confidence.5.80% pre-assembled：Comes 80% pre-assembled, so you can set it up in minutes with basic tools. The user-friendly design includes clear instructions, making it easy for both beginners and experienced riders to get on the road quickly.