Mountain Biking 2012 Calendar. This 2012 calendar features this exhilarating and ever increasingly popular sport, which not only pushes your physical ability to its limits, but also pushes you mentally too, as some of the terrain can be extremely dangerous. This 2012 calendar features 12 fantastic illustrations complete with month to view calendar grids. If you or someone you know loves mountain biking, then this mountain biking 2012 calendar will make an excellent and inexpensive gift idea!