See this video (thanx gsxr movistar!) on youtube: [media=youtube]-bZMvrPo34g[/media] and [media=youtube]ozppzywsLsk[/media] They were testing on chains, and it's well-known to be unsafe to have yr chain or even U-shackle lock lying on the ground after securing yr wheel. Gives the tea-leaf more leverage with his devices. I use a Abus Granit shackle, but the video shows they tested the Abus Granit chain, and that lasted some 17 seconds! Not sure how long my shackle wd last, but anyway it's secured either thru the forks or rear swing arm-brace.