If your bike is stolen, report to Police immediately.
You can also search this federal website for your bike: Canadian Police Information Centre – Search by Serial Number
Select locks that are more difficult to cut/grind. An opportunist bike thief will typically carry 36″ bolt cutter, cable/wire cutter, hack-saw, hammer and maybe a crowbar. If you use a good quality U-lock or cable lock, they will likely move on to a bike that is easier to steal. Even inexpensive bikes are routinely targeted.
The professional bike thief will also carry a more powerful 42″ bolt cutter, portable angle grinder and bottle jack that will remove any lock if they have enough time. Quality bikes may be stolen to order!
U-locks are relatively light, and easy to fasten. They are awkward to carry in your bag. If you use a mounting bracket, check frequently, as it can come loose. Make sure you the lock does not interfere with your riding safety if it hangs or mounts on your bike frame. Low quality U-locks or thin soft metal can be removed with a hacksaw. Selecting a U-lock with a looped cable extends the reach from front to back wheel.
This commuter bike was locked at the subway station using 3 U-locks from different points to the one post! This would make for a heavy ride, but more security when the bike is left at the station for the day.
These are heavier than U-locks and their length means you can lock more parts of the bike to the rack. You can even lock a couple of bikes together. Their weight will slow you down, especially important for a longer commute. You can select a Stationary chain with even more weight, for locking at home or at work. They are considered too heavy for transporting during the commute.
Lighter weight and more portable than U-locks, a folding lock is best for short stops and low to medium risk areas. Some have joints that cannot be drilled out and are difficult to cut with bolt cutters. No problem for angle grinders…
Sadly, these locks can be cut in seconds by thieves using wire/cable cutters. They are inexpensive and lightweight. They really are a minor deterence.