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Diameter 4.5inch, thickness 1.8inch Unable to install variable speed bicycle! ! ! ! ! ! More durable, suitable for 12 "/14"/16 "/18"/20 "children's bicycles Function: These heavy-duty rear training wheels provide the necessary safety and stability, which are required for the first road test of bicycles, and will also shine when riding. Installation type: suitable for most 12-to 20-inch single-speed bicycles with horizontal backward track fork ends, but not for those bicycles that fall half horizontally or vertically