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Rear Mountain Bike
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 NEW X-FUSION O2 02 RC NINETY SIX 96 REAR AIR SHOCK (MTB, 7.5" x 2")  US $54.99
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Mountain bike gears keep becoming very intricate. Today's bikes have as much as 27 gear ratios. A mountain bikes make use of a combination of a three differently sized sprockets in the front and nine at the rear to make gear ratios.
The thought behind these gears would be to allow the biker cranking the pedals at a consistent pace irrespective of the kind of slope you are on with the bike. This can be better understood by imagining the bike with only one gear. Every time you rotate one turn of the pedals the rear wheel would also rotate for one turn, the gear ration being 1:1.
If your rear wheel is of 26 inches in diameter, then with a gear ratio of 1:1, a full pedal twist would have the wheel cover 81.6 inches of the ground. If you pedal at a 50 RPM speed, this would mean that your bike can cover around 340 feet of the ground in a minute. This is equal to the walking speed which is just 3.8 MPH. This would be ideal for riding a steep hill but, it not good for going downhill or ground.
You require a different ratio for going fast. To go downhill at the rate of 25 MPH with a cadence of 50 RPM at your pedals, you would need a gear ratio of 5.6:1. Any bike with more gears would give you much number of increments from a gear ratio of 1:1 to a gear ratio of 6.5:1 that help you to pedal always at 50 RPM irrespective of the speed you are actually going.
It is difficult to observe any difference between the six of the gears that are very close each other on a common 27 speed mountain bike.
When you use in real, bikers usually tend to select a front sprocket that suits the slope they ride on and they stick to it, though it is very difficult to shift the front sprocket under heavy load. It is however very easy to shift the gears between on the rear.
If you wish to ride up a hill, it is always best to select the tiniest of the sprockets on the front and then shift between the available nine gears on the rear. You will more advantage if you have more speeds on the back sprocket.
Gears on the whole dictate the overall speed of your bike and hence are very important for mountain bikes. You would neither be able to build up speed nor would be in a position to pound the pedals without the gears. It is gears that help you in moving the pedals and also gaining speed.
You get all kinds of gears in mountain or road bikes, and all of these gears would help you in building a lot of momentum, if used in the correct way.
Alison Addy is a journalist who writes newsletters on bicycles for http://www.bikecyclingreviews.com, a focused website that offers the best articles on road bike review and bike gears.
Mountain Bike Designs
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.
About the Author
Webmaster of Mountain Bike Store
when talking about mountain bike rear suspension sizes...?
7.5X2.0
7.875X2.25
8.5X2.5
8.75X2.75
9.50X3.00
what do the 2 numbers mean?
The first number is the eye-to-eye mounting length where it bolts up to the frame. The second number is the stroke length of the piston. Suspension linkage designs are engineered very specifically around a particular shock design, so if you ever need to shop for a replacement shock for your bike, be sure to get one with the exact same measurements as the original. This is way important with some designs, but it's wise to follow that rule for all bikes. If you mess with either design aspects you'll usually end up with a bike that feels like crap and can sometimes damage either the shock or the frame.
Hope this helps. 
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