You are looking for a lock to use for a bike that is stored inside a locked room at your office? A mini u-lock around the rear wheel, attached to a beefy steel pole will provide you plenty of security. A high quality mini u-lock around the rear wheel does not provide enough empty space for effective leverage tools, and it is hard to picture someone breaking into that locked room during office hours and attacking bike locks with power tools.

The New York U-lock is certainly strong enough to deter even a skilled crook...if you get one of those, there would be no reason to also buy a chain lock.