Originally Posted by
2manybikes
No foolproof/robberproof locks. Some very good ones are on the Kryptonite web pages. There is a lot of good information about locking bikes there.
Kryptonite locks are good. Their coverage that you can get with them, situationally, can be good as well. But,
Any working lock should stop someone from simply walking away with your bike. Any good lock should stop someone from defeating the lock with a lightweight, concealable hand tool. But no lock will stop a skilled thief with powerful equipment. What a good lock does however, is buy you time and lose the thief stealth.
The best security you can get is a good lock in tandem with good placement, put the lock in a way that it makes life difficult for the thief, put the bike somewhere the thief is going to be sweating over getting caught.
I personally think it takes a fool to lock their bike behind a building with a $10 cable lock. It takes a bigger fool to go try and steal the one at the front with the u-lock/cable lock combo, and the pedestrians walking in and out of the building. Thats your protection, right there.