Now THIS is how to lock a bike.

A big thick cable going through both wheels and the frame, locked with a miniature U-lock (keyed) around a serious bike hoop... AND, a full sized U-lock with combination locked around the frame and the hoop. Two independent and disparate locking methods - far better than a single U-lock that also locks the cable and far far better than any single locking system.

I hate to offer a challenge to a thief, but I think most of them would find somebody else's bike to steal.