
Entails the sport of riding bicycles off-road, often over
rough terrain, whether riding specially equipped mountain
bikes or hybrid road bikes. Most
mountain bikes share similar
characteristics that underscore durability and performance
in rough terrain: wide, knobby tires, large frame tubing,
front fork or dual suspension shock absorbers. The durability
factor means a far heavier bicycle weight to rider ratio than
their road touring cousins.
Mountain biking is roughly broken down into four categories:
cross country, downhill, freeride, and trials/street riding.
Each has differing levels of safety-consciousness with different
types of mountain bikes and riding gear.

This
individual sport requires endurance, bike handling skills
and self-reliance, and can be performed almost anywhere from
a back yard to a gravel road, but the majority of mountain
bikers ride off-road trails, whether country back roads, fire
roads, or singletrack (narrow trails that wind through forests,
mountains, deserts, or fields). There are aspects of mountain
biking that are more similar to trail running than regular
bicycling. Because riders are often far from civilization,
there is a strong ethic of self-reliance in the sport. Riders
learn to repair their broken bikes or flat tires to avoid
being stranded miles from help. This reliance on survival
skills accounts for the group dynamics of the sport. Club
rides and other forms of group rides are common, especially
on longer treks.