Lock your bike whenever you are not using it, even if you will only be away from it for a short time. For short-term storage, lock your bike in accordance with your municipality's ordinances and properly use a good lock. For overnight or long-term storage, it is best to store your bike in a secure area or bring it inside.
Choosing a lock
Choose a lock specifically designed for bikes. While there are many brands and designs of good bike locks, generally U-locks are considered the most secure. Thin cable locks and chains with padlocks are easily cut. While a good lock can be expense, it’s cheaper than a new bike. Check out your local bike shop for options.
How to lock your bike
The most important part of locking your bike is to ensure the lock is both around your frame and the solid metal object you are locking to. Do not lock to an object that is movable or easily cut, like a chain link fence. Depending on your bike and lock, you may be able to use your lock to secure your rear wheel and your frame. You may use additional locks or a cable in conjunction with a U-lock to secure both wheels. Make sure to take any easily removable accessories with you.
Where to lock your bike
While bike parking rules vary by municipality, generally you may lock your bike to bike racks and sign posts on public property. Do not lock to trees, light posts, traffic signal poles, handrails or anywhere that will obstruct access to or use of the sidewalk. Check with your local ordinances for exact bike parking and locking rules.