【21-Speed Gearing & Dual V-Brakes】:Experience precise control with 21 seamless gear shifts for effortless uphill climbs and speedy descents. Paired with responsive front/rear V- brakes, it ensures instant stopping power in all weather conditions. Master any slope with confidence and safety.【Ergonomic Saddle & Non-Slip Pedals】:The contoured seat reduces pressure on hips and spine for pain-free long rides. Textured anti-slip pedals enhance foot grip and stability, even in wet conditions. Together, they boost endurance and prevent slips for maximum riding efficiency.【Durable Carbon Steel Frame】:Built with high-tensile carbon steel, the frame offers superior impact resistance and longevity. Its robust structure supports riders up to 250 lbs while maintaining optimal balance. Corrosion-resistant coating ensures reliability through seasons.【85% Pre-Assembled & Safety Certified】:Arrives 85% pre-built—all you need to install are the handlebars, front wheel, seat, pedals, and training wheels. Includes clear instructions and tools for hassle-free setup (15-20 mins). And if any problems arise, you can contact us at any time.