Bicycle Theft Prevention Tips Lock your bike to an immobile object that cannot be easily broken or cut. A good lock, which has a hardened steel chain and padlock or “U” shaped lock will help prevent a bike from being stolen. A good lock can make a big difference. Locks should not hang low enough to the ground that they can be smashed against the ground and broken. Maintain an accurate record of your bike description, including the serial number of your bike. Register this information with your local police department. Source: http://www.cpatoronto.org/crime_prevention_tips.htm