This mountain bike is equipped with a 21-speed transmission system, allowing riders to easily cope with different road conditions and slopes and enjoy a smoother riding experience.. Whether on mountain trails or city streets, this mountain bike can bring cyclists ultimate fun and challenge. Whether it's daily commuting or outdoor sports, this mountain bike is the ideal choice. | Winado | | Folding Mountain Bike Full Suspension 26" 21 Speeds Bicycle for Adult Men Women Sturdy Steel Frame, Front Suspension | Black | Best Buy