Unfortunately any bike regularly parked on a street is going to be easy prey, lightweight locks will deter opportunists but if someone decides to take it then it's going, many many years ago in a galaxy far far ohh hold on wrong story, mate of mine had his bike stolen from university pay car park with security, turned up in a van, which actually drew attention to it from the office on 5th floor, ohh its OK I have 2 locks on it, out came the stihl saw and off went the locks, security didn't even manage to stop the van, which was also stolen, it was gone in the back of the van before they made it to the ground floor. May the force be with you, as long as it's not the met.