When it comes to mountain bike racing, there are few disciplines which offer a risk/reward ratio as savage as urban DH. With the Red Bull Valparaíso Cerro Abajo course cobbled together from residential hillsides, riders are forced to hunt for seconds off the clock amidst the rooftops and stairways of everyday life. Czech Republic's Tomas Slavik charged out of the start gate at 100% and didn't let up for a moment, resulting in one of the most gnarly mountain bike runs we've ever seen, and a well deserved 1st place win.