folding speed control bike disc brake installation-free mini bicycle motocross 12/14/16 adult primary and secondary school students universal

12-inch black single-speed brakes + gift bag(12寸黑色单速抱刹＋送礼包) 12-inch white single speed brakes + gift bag(12寸白色单速抱刹＋送礼包) 14-inch single-speed disc brake white + gift bag(14寸单速碟刹白色＋送礼包) 14-inch black single-speed disc brake + gift bag(14寸黑色单速碟刹＋礼包) 16-inch black single-speed disc brake + gift bag(16寸黑色单速碟刹＋送礼包) 16-inch white single-speed disc brake + gift bag(16寸白色单速碟刹＋送礼包) 14-inch white variable speed disc brake + gift bag(14寸白色变速碟刹＋送礼包) 14-inch black variable speed disc brake + gift bag(14寸黑色变速碟刹＋送礼包) 16-inch white variable speed disc brake + gift bag(16寸白色变速碟刹＋送礼包) 16-inch black variable speed disc brake + gift bag(16寸黑色变速碟刹＋送礼包)

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