The lithium battery revolution has made “someone has to break something to get your bike” an impossible goal. I occasionally see Kryptonite U locks with neat an

The lithium battery revolution has made “someone has to break something to get your bike” an impossible goal. I occasionally see Kryptonite U locks with neat angle grinder cuts through the end hanging from bike racks around Brooklyn. The only thing that would really work is ABUS’s aluminum-shrouded U lock which will make an attacker go through a few cutoff wheels before reaching the steel hasp. But it weighs 30lb. Really the thing saving you is that jerks with angle grinders are pretty rare, and a U lock will stop any opportunist.