Originally Posted by crawdaddio

The Krypto hex chains are very good. They resist bolt cutters well. Much better than the cables if you don't mind the weight penalty. I would use a quality U lock through the frame/wheel in addition to the chain though.

I.E.: Don't just loop the chain through the bike and around the bike rack/pole using the lock to close the chain. Rather, get the U lock around the rack/post as well.