29137 12 bb products are offered for sale by suppliers on Alibaba.com, of which kids' bike accounts for 1%, rc parts & accs accounts for 1%, and ride-on cars accounts for 1%.
A wide variety of 12 bb options are available to you, such as steel, aluminum and aluminum alloy.You can also choose from 12, 12 bb,as well as from yes 12 bband whether 12 bb is v brake, or disc brake.