The designs for mountain bikes can be classified in three categories based on suspension:

1. Hardtail - A frame with no rear suspension, often containing a front suspension fork.
2. Fully rigid - This is a sub type of hardtail, with a rigid fork.
3. Dual or full suspension - These bikes offer a front suspension fork and a rear suspension that are integrated into the frame.
4. Soft tail - Offers a frame with a small amount of rear suspension, normally less than a full suspension frame.

The different designs of bikes in mountain biking will offer you what you need for your unique style of riding.  You'll want a different bike for  different terrain, such as cross country or  downhill.  As the terrain changes, you'll want to make sure you have the right bike for the job.

Mountain biking is different than any other sport, offering you plenty of excitement and thrills.  If you are new to mountain biking, you'll find the different designs to be very enticing yet very challenging at the same time.  Each design serves a purpose with mountain biking, even some that excel on the trails.

There are also several other designs which reflect on the manny challenging disciplines in the sport of mountain biking.  No matter what type of  mountain biking you like to do, there are bikes for that specific discipline.

If you are new to mountain biking, you'll want to check out the many designs and types of biking before you purchase a bike.  Mountain biking can be a lot of fun and excitement, although it can also be very dangerous if you don't have the  right bike for the terrain.  Before you decide to buy a bike and hit the trails, make  sure you have the right design of mountain bike for the riding you are planning on doing.

(http://www.bifzacycling.com/tips-sepeda/mountain-bike.html)