There is a type of liability insurance that is required to rent bicycles that makes it almost cost-prohibitive, so we don't. Very few places (that I know of anyway) still do. In general we don't sell bikes for little kids. We almost always have some 24 inch wheel bikes, and once in a while a 20 inch that we took in on trade.
This is a community information sharing forum and is not a direct contact point for any business. That said, they only sell really expensive professional-type used bikes priced in the 100s or 1000s, nothing for grandchildren.
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