More than two million bike thefts occur in North America each year, which averages out to one hoist every 30 seconds. Fortunately, designers and makers of bike locks are trying to decrease that number. If your bike is cheap, just chain your ride to a tree. For people with expensive bikes or anyone else who simply wants to foil a bike thief, new approaches to locking down your bike can safeguard your investment. Consider these features for the most protection.