California Mountain Bikers Are Asked to Ride in the Name of Science originally appeared on BikeMag.

This is the shocking moment a mountain biker hurtling downhill crashed into a tree. Thirdy Manaay, who was wearing a helmet, was speeding through the terrain when he suddenly lost balance during the ...

This biker attempts to bounce his way up a series of rocks. After he reaches the top, he bounces off and goes to the ground but ends up snapping his frame while celebrating at the bottom.