It seems to be common knowledge that wearing a helmet while biking is the smart, safe, necessary thing to do. Helmets are credited with reducing head injuries from cycling by 85 percent in the most optimistic study (Thompson, et al. 1471). With expected benefits of widespread helmet adoption so high, it is understandable that governments would be interested in legislation that makes helmets mandatory for bicyclists. But, despite the common assumption, mandatory helmet laws are not as effective or beneficial as they seem at first glance. Mandatory helmet laws should not be enacted because they are not the most effective way to reduce cycling deaths; additionally, they fail to differentiate between transport and sport cycling and therefore result in an undue burden on cyclists.