Even small bolt cutters will fit 12mm links in their jaws. I think you want a hardened chain, so at least they struggle to cut it.willevans said:I just got a hitch rack (Raxter 2-bike) and am trying to figure out a good way of securing two bike while I'm at work. I park in a low crime area in my works parking garage. I was thinking about getting a "cut-resistant" security chain of about 6' from mcmaster.com ($5/foot) in the 10mm size. I'm trying to decide if I should go with a 13mm chain or a 10mm cut-resistant chain. I'm thinking if the chain is thick enough that it won't fit in bolt cutters than I won't have much else to worry about.
What is more important in a chain; link diameter, heat treating (cut resistance but doubles the price), or breaking strength (schedule 30 versus schedule 70)?
I've seen plenty of videos of 48"ish bolt cutters going through even the largest chains. At least one of those videos was of a thick ABUS chain (and highly regarded), which should have been hardened.
I have two chains, an 8' ABUS noose-style in 12mm square links, and a 5' Kryptonite with 11mm hex links. The noose-style is more useful, but the Kryptonite is way way burlier.
Check out http://www.lockitt.com/chain.htm for a variety of chains (and if you follow the links up, cables), mostly intended for motorcycle use, but also work well for locking bicycles if you can leave it in your trunk when not in use.