The best locks
Any external lock can be defeated. I could easily cut that particular lock off in a second with a bolt cutter without damaging the bike, A better lock would be integrated into the frame. Breaking an integrated lock would break the bike, making it useless.
It is best to think of locks as devices that keep "honest people honest". Some people would break an expensive bike just for fun or to steal parts.
Once, a person cut a "club" from the steering wheel of a car and hotwired it and parked it across the street with a note that said "the club ain't worth *hit" just to prove a point.
Some expensive locks cost more than a used bike or cheap new one. Think about it before purchasing.
