dirt jumps - Recherche Google
Bike Jump Designs | http://www.crank.co.za/the-anatomy-of-dirt-jumps/343
When I attempt switchbacks on my mountain bike. >_<
backyard pump track - Google Search
How fast do you need to go to get up to the top portion of that bank? Not sure I'd be willing to find out.
Mountain Biking MTB Bike Trail
Man, I want this helmet!!!
Unreal Mountain Bike Trail!