I've had my bars rolled back like that for a long time. It angles the grip down a little and makes for less of a bend in the inside wrist when hanging off the bike.
Sooooo I have had the bars rolled for almost a year and the other day I did a very light low wheelie (on private property of course) anywhow it was at most 6"to 12" of the ground and when i came down I felt the handle bar slightyl roll.
at first I was not sure if it was just me considering I dont really wheelie much at all kinda just starting to test the waters.
anyhow when I got to the next gas station or parking lot I turned bars all the way ans sure enought it was hitting the tank.
moral of the story is be sure you properly tighten your bars back up. anybody know the proper torque for the bar mount screws???
i will go and buy a tourque wrench in 10 min at lunch.