I don't understand why you think lockrings are dangerous. If you use a lockring as your only means of stopping, yes, I can see that. I have a wonderful road-adapted Masi fixie with front and rear brakes AND a lockring. I love riding it on relatively flat terrain. It is a great tool to get a better workout when time is short (like after work). I have ridden it on a century once - one hill on the whole route - on the last mile. It was a killer!