I dunno - I've spun lockrings and cogs off before... now I do it with no brakes... No chance in hell I'd ride without a lockring that I knew was going to keep my cog on there. Do you ride w/both brakes or something? What do you use to keep it secure? Or is it an old-skool of the bolted cog? I know that any cog I put on would come off when I backpedalled if I didn't make sure it was really on there and had a lockring against it...

Wait - I got it - you never stop!