Bartender Matt Carucci says he rarely feels safe biking in the city but often rides without a helmet anyway. "There are a lot of other ways to hurt yourself," he says. John Rose/NPR hide caption itoggle caption John Rose/NPR Shots - Health News Why Do Bike-Share Riders Skip Helmets? May 3, 2012 Researchers found that only 20 percent of riders using shared bicycles wear helmets, despite the risk of injury. We took to the streets of Washington, D.C., to ask bicyclists, with and without helmets, about their choices.