детский велосипед студент горный велосипед 20-дюймовый 8-15 лет мальчиков и девочек big детей переменная производители скорость автомобилей

material carbon steel car number 016 frame structure whole car processing customization yes brand jie mengdi folding no propulsion mode chain model 20-inch 22-inch load 100kg brake system double v brake frame type hard frame front fork type resistance glue (mid-range no damping) configuration level standard pedal type ordinary pedal brake type rear brake color single speed blue gift bag basket rear seat frame single-speed chinese red gift bag car basket rear seat rack single-speed black red gift