A nice bike has nothing do with it. I live in wicker park and have seen about 6 bikes totally stripped leaving just the frame + ulock in the last 2 weeks or so. These bikes have ranged from schwinn beaters to a couple nice bikes. Whenever I leave my apartment and I see a bike not locked up well I can pretty much guarantee if it sits there more than a few hours *something* will be missing from it. The whole bike is even worse of course, but what it boils down to is chicago is a raging stolen bike city, which is why I sadly stick with beater bikes because I *know* the bike is going to get stolen at some point or another.