There are some gravel, dirt roads, single & double track. it is a large climb of the valley of mexico starting at an altitude of about 1.3 miles. it is a long climb but wll worth the views, downhills and overall experience.
This has to be one of the coolest trails I have been in. I never got to the end of the trail even after 15 mi aprox. turned around and went downhill for most of the return.
How to get there:
The park is well known by everyone ask for directions to "el Ajusco" once there you should be able to see mountainbikers when you are getting close, otherwise ask for the biking park.
Closes early for security reasons, small charge to enter park. go in groups for safety and preferabl