Are you not able to fit a ground or wall anchor? It's easy, assuming you are allowed to, and some are seriously chunky. Secure the bikes to that using a recommended heavy chain and lock and/or a couple of the D locks mentioned in this thread (like the Kryptonite NY series).
Are you not able to fit a ground or wall anchor? It's easy, assuming you are allowed to, and some are seriously chunky. Secure the bikes to that using a recommended heavy chain and lock and/or a couple of the D locks mentioned in this thread (like the Kryptonite NY series).