Mountain biking is an extremely popular these days.  However, there are numerous bikes to select from.  What type of bike you need to purchase depends on what type of riding you prefer.  There are four different types of bike available.  The first type is cross country.  This model is easy to ride over most terrains, including up and down hills.  You can use it easy for riding on the path or commuting.  All this is possible because they are lightweight, and they are the most common type of mountain bikes.    The second type is downhill and are anyone that is really a serious biker who long for the ultimate adventure.  They have front and rear suspension, disc brakes, and very strong parts.  The third type is trials and you will need a great degree of skill for trail mountain biking.  This is the precision riding of the sport.  Most trail riders wants to build their own bikes.  They are very light and extremely strong.  This type of bike takes a lot of discipline.  The fourth and last type is jump and slalom.  This type of bike is designed for demanding activities such as jumping, slalom, and street racing.  They are incredibly strong and has front suspension.  Which one of these types you will choose, depends on your style.