I bought a modern GT avalanche recently ( parts only) from a guy who had moved to a crack head infested area, he had attached the bike to a frame bolted and cemented to the wall and then secured with a variety of chains, d lock etc, the theif after spending some time it seemed tring to chisel the frame from the wall, got frustrated and put the chisel through the bike frame in two places on the rear stays just to ruin it and because he couldnt have the bike, he then preceeded down the road where he smashed 3 car windows again just out of anger and badness
an unsecured front or rear wheel is a bag of smack to these guys and they dont give two fooks whether it is a low end gt or boutique irreplaceable bike the steal