Biking around Victoria means frequently locking your bike up. In many cases you are nearby and just want to stop the grab and run type thief. Being the lazy biker I am I have stopped locking my bikes for those occasions and un-locked them. I just use a standard long-ish cable and run it through my bikes, around something solid and then put the free end over a grip and snug it up to the stem.
This is fast an requires no locks, keys or combination codes to be used. A thief that simply tries to grab a bike will just tighten the whole shebang making it impossible to undo. In order for a thief to figure out which end to undo and how to do it they’ll need to be up close to my bikes for long enough that I’ll have time to intervene.
If you get a cable that is a tight-ish fit over your grips you’ll slow even the craftiest thief down so they can’t get your bike faster than you can throw a beer bottle at them from a patio!
Of course I don’t use this type of setup when I’m walking away from my bikes for any length of time.