Understanding Mountain Bike Gears
The gears in off-road bikes just keep getting more and more complex. The bikes of today have as many as 27 gear ratios. A mountain bicycle will utilize a
Fusion of three different sized sprockets in front and nine in the back to provide gear ratios.
The basic concept behind all of these gears is to allow the rider to crank the pedals at a continuous pace no matter what sort of slope the bike is on. You can understand this better by picturing a bike with simply a single gear. Every time you rotate the pedals one turn, the rear wheel would revolve one turn as well ( 11 gear ratio ).
If the rear wheel is twenty-six inches across, then with 11 gearing, one full twist on the pedals would end in the wheel covering 81.6 inches of ground. If you’re pedaling at a speed of fifty Rpm, this means that the bike can cover over 340 feet of ground per minute. This is only 3.8 Miles per hour, which is the equivalence of walking speed. This is ideal for climbing a steep hill, although bad for ground or sliding downhill.
To go quicker you’ll need a different ratio. To ride downhill at 25 Miles per hour with a 50 Rpm intonation at the pedals, you’ll need a 5.6:1 gear ratio. A bike with a lot of gears will give you a sizeable number of increments between an eleven gear ratio and a 6.5:1 gear ratio so that you can always pedal at fifty Rpm, regardless of how fast you are really going.
On an ordinary twenty-seven speed mountain bike, six of the gear ratios are so close to each other that you can’t notice any difference between them.
With tangible 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 tricky to shift under heavy load. It’s much easier to shit between the gears on the rear.
If you are cranking up a hill, it is 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 will have.
At the end, gears are vital to trail bikes as they dictate your general 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.
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