Gravity biking started in the hills of California but took root in Colombia where it now thrives as an outlaw sport. As the name implies, gravity biking is downhill cycling where momentum is solely generated by incline (no pedals, chains, gears allowed). Aerodynamic postures are key to winning (tuck position) and quite frankly so is a touch of loco. These dudes haul ass and these roads are not closed to traffic. This is “gravitosos”: