<p>Don’t bother with combo locks. I think a flat-key Kryptonite is your best bet. </p>
<p>I’ve been doing something similar to the video above with a few changes (can’t fit the U around without some jiggling and the cable goes through the shackle instead) but it’s kept my rather expensive bike from being somebody else’s.</p>
<p>I also use that cable and it won’t fit in between the rails and the saddle. Use it for your wheels instead.</p>