Watch an extreme mountain bike ride down the Portal Trail in Utah from the comfort of your own home in this cool video. Filmed by mountain biker Nate Hills who is trailing rider Kyle Mears on the lower portion of the rugged Portal Trail. This is a very dangerous trail and should only be attempted by expert riders. These guys make it look easy but one mistake and they could go crashing down the mountain. To see the upper section of this trail watch Mountain Biking In Moab.