wherever i go i use a heavy chain and big lock. while i am riding i put the chain over my shoulders and across. its very heavy even without the lock but i am used to it. i neevr go withotu it. when i get off i put the chains around as much bike as possible menaing that i try to cover the rear tires, frame and of course the locking pole. sorry to hear all you guys loosing bikes but the key is to lock your bikes in as visible area as possible. cable locks, combinations locks and much other skinny locks (no matter how much the bike shops say they are real good) dont get them. the point is to DISCOURAGE the bike pickers and this has worked for me entire four years. my frnd bought a bike and he used to just lock his bike on a pole and walk away acting very careless. the bike pickers look for that Attitude. and his bike got stolen within ten months and now is without a bike.