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How to lock your bike 
Pop off the front wheel. 
If your bike has a quick-release front wheel, remove it and place it next to the rear wheel for locking. 
If you can't remove your front wheel, or your u lock is not large enough to encompass both wheels, secure the rear wheel then continue reading for alternatives.
Secure the wheels and frame to an immovable object. Using a " d " or " u " lock, secure the back end of your bike to another object.