I was thinking about using this with a small key lock attached Everbilt 3/16 in. x 6 ft. Galvanized Wire Rope Security Cable-803182 - The Home Depot that way it could easily fit through frame/both wheels and around a pole or something. Only weighs 6oz. If you wanted to go really lightweight just to prevent crimes of opportunity then you could put loop ends in metal guitar string with a small metal luggage lock... just pray that a guy like Jaws from James Bond doesn't come along