Many aspects of the dirt bike life are problematic, with the safety of bikers and pedestrians paramount. But watching the film "12 O'clock Boys," a documentary about Baltimore's dirt-bike community, I'm struck by an overwhelming culture of pride in this brotherhood in which young men seek out black male role models — even if they don't fit the dominant culture's definition of one. In a city where so many black citizens feel disenfranchised by those in power, dirt bike culture offers more than just a pastime; it is a powerful act of resistance. Police versus riders. Cat and mouse. David and Goliath.