Unless my bike is in my office, which itself can be locked, I always lock my bike. When it's out of sight, it gets locked. No exceptions. Bike theft is mainly one of opportunity; when it's gone, it'll suck big time. You'll be kicking yourself why you didn't take the extra 1 minute to securely lock up what you depend on - or at least really like owning - on a daily basis.

I even lock the bikes up when they're in my garage (which is itself locked). I can't count the number of times I'm moving stuff in and out of the garage into the back yard (e.g. lawn mower), and so things in the garage are exposed for at least a few minutes. All it takes is for someone to cruise by, see your nice bike sitting along the wall, and scurry off with it.

Nothing will stop a determined thief (you got to see this!), but a lock will give you peace of mind for 99% of the time.

http://bc.ctvnews.ca/shocking-video-...ight-1.1442261