Posted on September 01, 2010 by Dave W

 How Mountain Bike Gears Work

The gears in mountain bikes just keep getting more and more intricate. The bikes of today have as many as 27 gear ratios. A mountain bike will use a combination of three different sized sprockets in front and nine in the back to produce gear ratios. The idea behind all these gears is to allow the rider to crank the pedals at a constant pace no matter what kind of slope the bike is on. You can understand this better by picturing a bike with just a single gear. Each time you rotate the pedals one turn, the rear wheel would rotate one turn as well (1:1 gear ratio).

If the rear wheel is 26 inches in diameter, then with 1:1 gearing, one full twist on the pedals would result in the wheel covering 81.6 inches of ground. If you are pedalling at a speed of 50 RPM, this means that the bike can cover over 340 feet of ground per minute. This is only 3.8 MPH, which is the equivalence of walking speed. This is ideal for climbing a steep hill, although bad for ground or going downhill.

To go faster you’ll need a different ratio. To ride downhill at 25 MPH with a 50 RPM cadence at the pedals, you’ll need a 5.6:1 gear ratio. A bike with a lot of gears will give you a large number of increments between a 1:1 gear ratio and a 6.5:1 gear ratio so that you can always pedal at 50 RPM, no matter how fast you are actually going.

On a normal 27 speed mountain bike, six of the gear ratios are so close to each other that you can’t notice any difference between them. With actual use, bike riders tend to choose a front sprocket suitable for the slope they are riding on and stick with it, although the front sprocket can be difficult to shift under heavy load. It’s much easier to shift between the gears on the rear.

If you are cranking up a hill, it’s best to choose the smallest sprocket on the front then shift between the nine gears available on the rear. The more speeds you have on the back sprocket, the bigger advantage you’ll have.

All in all, gears are very important to mountain bikes as they dictate your overall speed. Without gears you wouldn’t be able to build speed nor would you be able to pound pedals. The gears will move the pedals and help you build up speed.

There are all types of gears available in mountain bikes, all of which will help you build up a lot of momentum if you use them the right way.

Disc Brakes Or Rim Brakes

This can be a very important decision when you are buying a mountain bike. There are actually two answers to the question of disc brakes or rim brakes.

If you want better, more consistent brake performance in all conditions, disc brakes are what you should be choosing. On the other hand, if you want the lightest set up you can have and you are

willing to accept small variances in brake performance, or you want the lowest price possible, rim brakes are what you should be choosing.

Over the years, mountain bikes have gone through many design changes. They started out with the original cantilever brakes, then went through the U Brake years, and are now with V Brakes. In most conditions, the V Brakes seem to work well.

In wet or muddy conditions, rim brakes will perform poorly. Over time, they can wear right through the side of your rim, causing the side of the rim to blow right off.

Disc brakes on the other hand have been around for a long time in cars but weren’t used on bikes much until the late 1990′s. There were some issues in the earlier models, although the cable actuated or hydraulic brakes of today seem to work quite well.

In terms of performance, disc brakes seem to work better than rim brakes, especially in wet or muddy areas. Disc brakes normally require less force to apply and aren’t affected by the rim or wheel condition.

Cost is an issue, as disk brake systems tend to be more expensive than rim brakes. Mechanical or cable actuated brakes are a closer match, although they will still cost more. Hydraulic brakes on the other hand cost a lot more.

When you make that final choice, weight out the above options then make your decision. Some riders prefer disc brakes, while others prefer rim brakes – making it a matter of opinion.

Mountain Biking Safety Tips

There are numerous ways that you can improve your mountain bike safety. Many riders will tell you that wearing a helmet is the most important step to staying safe. The second most important step is that you should always ride in control of your mountain bike.

By riding in control you’ll not only prevent crashes, but keep others on the trail safe as well. When riding out of control you lose the ability to adjust to the terrain as you ride over it. This can and usually does result in serious injury to yourself and others.

Follow these helpful guidelines and you’ll remain safe when riding your mountain bike.

Gear

Always make sure that you wear a helmet and other necessary safety gear for the conditions that you plan to ride in.

Never ride beyond your control. There is never any shame in walking the areas of the trail that you don’t feel comfortable in riding and you should never let anyone else tell you that there is.

Keep your speed under control

Always make sure you keep your speed at a level where you can quickly adjust to any obstacles or change in the trail.

Knowing your trail

You should never push the limits on trails that you aren’t familiar with. You should take trails you aren’t familiar with at slow speeds until you learn them better.

Slow down around blind corners

If you can’t see past a corner you should always slow down, as you never know who or what is around it.

Start small then go big

Work your way up to stunts or obstacles. Practice in less difficult or dangerous situations before you move up to something more dangerous.

Playing it smart

If you start to question what you’re doing, you probably shouldn’t be doing it. Always think about what you are doing and go with your instincts.

Keep Moving

Dave W

Cycling For Fitness

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