chains security

[fazersharp]

100% safe system is also a useless one.  Hard to carry too thick of a chain. 12mm chain core hardened should make most bolt cutters useless, or take some really long levers - over 1m. With enough time, tools and determination, any bike will get stolen, it is usually enough to make your bike less expensive and better secured than the next.

Yep those 16-19 mm chains are not for carrying about with you