best mountain bike 1.high quality 2.competitive price 3.timely delivery 4.up-to-date mountian bike best mountain bicycle:1. Bike size: 18 ... ", 20" 24" 26" 28:; Foldable and unfoldable2. Color: To order3. Bike frame: Steel and painting, thicker argon-arc welding/CO2 welding4 ... : Steel and painting, CO2 welding steel/ suspension fork5. Bike rim: Steel, alloy or aluminium6. Handlebar and stem: CP, argon- ...