RSS videos youtube ?

http://www.youtube.com/results?search_query=all+mountain+biking&oq=all+&gs_l=youtube.3.0.35i39j0l9.413.878.0.3609.4.4.0.0.0.0.165.165.0j1.1.0…0.0…1ac.GFe9HPx3W4A