Mountain biking means that the surface on which you will ride is rough and uneven. This type of biking is done off the road. Bikers use specially designed bikes for this purpose. The trails for mountain biking depends on the type of biking one plans to do. There are four different types of mountain biking these days and the trails depends on the safety requirements as well as skill levels of each type. The four types are : Cross country, free ride, downhill and street riding. You can do the biking anywhere if you have the required stamina, skills and dexterity.