Locking your bike
Here are some quick tips for locking your bike:

• Lock each wheel to an immoveable object or the bike frame. See photo below.
  
• Lock the frame to an immoveable object - preferably a bike rack, or parking meter. Avoid sign posts (they can be more easily removed from the ground) and scaffolding (they are private property).
  
• Use a U-lock that uses a flat key and unlocks from the middle of the lock bar - do not use a U-lock with a cylindrical key or one that unlocks from the end of the lock bar.
  
• Use two different types of locks; for example, use a cable or chain that has a padlock, and use a normal U-lock. Different tools will be need to defeat each lock - that's kind of a lie: a grinder can cut through almost anything, but a grinder prefers U-lock bars because they are steady, whereas the links in a chain will be tougher for the grinder operator to grasp.
  
• Remove your seatpost or lock it to the bike (via cable or locking bolt).
  

How to NOT lock your bike

• Do not leave your bike in any single location for more than 7 days. The city can and will remove it.
  
• If your bike is "picked" for parts, take it home it immediately. Chicago has a lot of bike shops so go buy the new part and ride it home. Or call a friend with a car. The city can and will remove it.
  
• Ride in a straight line. Everyone loves predictability and riding a bike shouldn't be any different.
  
• Use a headlight and taillight. These come to your advantage to prevent people from hitting you and when someone hits you, it comes to your advantage again if you choose the sue the offender.
  
• Use hand signals. Let motorists and other bicyclists know where you're going. Predictability again.
  
• Report harassment. Let the police know of areas that are becoming less safe for bicyclists.
  
• Report reckless driving.
  
• Carry pepper spray.