To protect your bike, absolutely use a bike lock. Use a high quality hardened steel u-lock for the frame and heavy cable lock for the front wheel. Take a high resolution photo of your bike and record the serial number. You can buy recommended locks at the UBC Bookstore (Kryptonite) and the AMS Bike Kitchen (Abus) on campus – locks are available to suit all budgets. Good locks are not cheap, but the protection they offer can be worth the investment.