Choosing a Lock
It is important to understand what types of locks are available. The best bet to ensure your bike's safety is to secure your bicycle with a combination of locks. Using a cable plus a U-lock is a very popular choice. This requires the bike thief to need a larger assortment of tools and forces them to take more time, making it less appealing to steal your bike.
It is not good enough to just lock your front wheel
(that's a really good way to loose your frame
and your back tire)
as it leaves the rest of the bike vulnerable. Always remember to secure all expensive and easily removable components on your bike, such as both wheels,
and the seat. If you spent hundreds of dollars on your bike, would you be using a ten dollar lock?Full Article