children's bicycle boys and girls adult middle and big children primary school students 6-8-10-12-15 years old variable speed new mountain bike 儿童自行车男女孩成人中大童小学生6-8-10-12-15岁变速新款山地车

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18-inch [suitable for height 115-130cm]] 22 inches [suitable for height 140-155cm]] 24-inch [suitable for height 150-170cm]] 20-inch [suitable for height 125-140cm]]