my bike shop recommended securing the seat to the frame using an old bike chain shielded in rubber. It allows you to adjust the seat (until there's no slack in the chain) but you can't remove it. A determined thief could cut the rubber and unlink the chain, but who wants to go thorugh that trouble when there areā€¦ » 5/29/14 12:53pm 5/29/14 12:53pm