Locks that work

***1. Are you suggesting that a 13mm diameter squared section of hardened steel, should give a similar performance to a 10mm section? More mass would mean more time required to cut. ***

2. Are you also suggesting that the Secure-A-Bike chain has the same steel formulation for hardness as the ABUS Granit X-Plus? I don't think so somehow. Therefore we can imagine that the two types of steel have different levels of hardness, and I'd put money on the ABUS being quantifiably superior.

I too thought the Abus would resist cutting better, but the video shows the angle grinder going through it like a knife through butter (6 seconds for one cut, so 12 for the two required), the Kryptonite fahg seems to have a better resistance to angle grinders from the tests I've seen. Unfortunately Simplicissimus lost his bike even though he was not far away, maybe a disc alarm and thicker u-lock would have stopped the theft. I was thinking of getting an Abus 54, but now would get a NY Fahg or Abus 59 as minimum.