And a small piece of TNT will do the job even better. Not to mention bottle jacks etc. The point is that no sane thief will use an angle grinder unless the bike is well worth it. The bike thieves use bolt cutters with screw-in handles which are easy to conceal in a backpack and are silent unlike the angle grinders. So why don't you try using them on on top Krypto locks instead of trolling on this forum?

PS