Locks that work

in the other topic he went on in such length on explaining why we shouldn't use chain, since they're all can be easily be cutted by a bolt cutter from a fire station (including a youtube video showing a person cutting chain using a bolt cutter off a motorbike's front wheel.

I kinda disagree as locking it carefully (i.e. tight as possible, high up from the ground) can make it pretty secure.

what i said was that chains are not as secure as D locks are.
Use them if u want. Do whatever, just putting it out there, the info upon people preconceptions on chians.