Have you asked the question: How long will an unchained bicycle last in a city street. An Argentinian publicist has set out an experiment to gauge the crime rate in a city by leaving an unchained bicycle in different streets and counting the time it takes before it gets stolen. He used hidden cameras and cheap bicycles as a bait. The assumption is simple. If it takes longer for a bike to be stolen, then chances are the crime rate on that city is low. You can see the full article in this link:
How safe is your city? Put it to the bicycle test
I wonder how long will it take for a unchained Road Bike to get stolen? I'd never ever do that with my bike. No Way!