Information Tips - Lock it up, no matter how short a period of time you intend to be away. Lock to something immovable and solid. When using a U-lock, position your bike frame and wheels so that you fill or take up as much of the open space within the U-portion of the lock as possible. The tighter the lock up, the harder it is for a thief to use tools to attack your lock. Spend a suitable amount of money. You do get what you pay for. Police guidelines suggest that you spend approx 10% of the value of your bike on a lock to secure it. For the greatest theft deterrence, use two locks such as a U-lock and a locking cable. The longer it takes a thief to get through your bike security, the less likely your bike will be stolen.