Amazon.co.jp: Hardtail Mountain Bike 26 Inch 21 Stage, High Carbon Steel Frame, Double Disc Brakes, Front Suspension Anti-Slip Bicycle MTB for Adult, Gray : Sports & Outdoors
Amazon.co.jp: Adult Mountain Bike, Shimano 21/24/27 Speed Drivetrain, High Carbon Steel Frame 24/26" Wheels, 6-Spoke Black24in-24 Speed for Men and Women MTB Bicycles with Disc Brakes : Sports & Outdoors