My daughter's bike that is too small for her, and my husband's bike that he has not ridden in over a year came in really handy when our nieces & nephews were up visiting one day and I took them all to the park. The older 2 stayed home by themselves and I distributed the younger ones on all the different bikes plus one in a trailer and we had exactly enough and more or less the right sizes. We still have those 2 bikes "just in case"!