For securing the bike to something immovable e.g. a pole, I use a length of 12mm high tensile chain (which i "borrowed" from work. Its only a meter long, enough to go through the frame and around something solid. Yes it heavy, but I believe its worth it, and I really doubt you would cut through it with a pair of bolt cutters. for pad locks - Assa Abloy Lockwood with Boron Steel shanks. They are pretty cheap and Boron is supposed to be uncuttable with bolt cutters. some people will argue against this (as not all locks are made equally). But in my own experience (using the Assa Abloy Lockwood's) the teeth on the bolt cutters shatter first. Ignore "hardened" or "special alloy" etc - Boron is the only way to go. You can also buy boron steel cables, but i prefer the high tensile chain.
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