Anyone who rides their bicycle to school, work or just to town for some shopping needs to invest in a great security system that includes both a U-lock and cable lock so the bike does not get stolen or damaged. Many people simply connect their frame to a bike rack with a U-lock, and while these are very helpful in making sure no one walks off with the entire bicycle, thieves can still steal the wheels. A cable lock prevents this from happening.
A cable lock is an unbreakable cable usually coated in a rubberized material so it does not scratch the bike or its paint job. They come in varying lengths and you should purchase one that is the appropriate size for your bicycle and the type of rack or other object you attach it to to keep it safe. For example, if you lock your bike to a large tree, you need a much longer cable.
First, use the U-lock to shackle the bike frame securely to the rack. Next, get out your cable lock and open it. Snake the cable through the U-lock, around the rim of each tire and around whatever you are locking the bicycle to. This cable lock can then be closed and locked either with a key or a combination mechanism. The combination of these two locks with an appropriately affixed cable will keep your bicycle as safe as it possibly could be when you ride it into town.