Mountain biking is a cycling competition performed in natural circuits usually through forests along narrow roads with steep slopes and very fast descents.
Bikes tend to be made of aluminum, titanium, carbon or other alloys as lightweight as possible, carry adjustable front suspension through spring, air or oil or both; Some also used shock absorber for the rear rim which called it shock; most used 9-speed gearbox sprocket rear wheel, 3-speeds in the catalina, i.e. three dishes of teeth.
The brake is powered through a usually metal handle. Until the end of the 20th century only seen brakes from rim, with pneumatic pads triggered by a wire rope. Additionally requires the use of the following accessories: special helmet, gloves long fingers, clip pedals and shoes for this type of pedal.