| Bikes are very common transportation vehicles in our | | | | example, if the diameter of the bike's rear wheel is |
| daily life. With people's increasing awareness of | | | | about 26 inches, one full turn on the pedals will make |
| environmental protection, most of them choose to ride | | | | the wheel cover about 81.6 inches of ground. If your |
| a bike rather than drive a car. Bikes are made of | | | | speed is faster, obviously, your bike can cover more |
| many different components, among which gears are | | | | with the same time. To get the faster speed, you |
| quite important. | | | | should change your gear ratio. Riding under the |
| There are various kinds of bikes, one kind of bikes is | | | | different conditions require the different gear ratios. |
| called mountain bike. Maybe it is not quite familiar to us | | | | As is known to all that mountain bikes are mostly used |
| Chinese, it is very common for foreigners. Today I | | | | on the slope, so many bike riders like to choose a front |
| would like to talk something about the mountain bikes | | | | sprocket which is suitable for slope they are always |
| and gears. | | | | riding on for actual use. Many of you may have the |
| Gears in mountain bikes are becoming more and more | | | | chance to climb a hill with your mountain bike, in such |
| complicated in them. In front of these bikes, there are | | | | situation, it is better for you to choose the smallest |
| three different sized sprockets, while in the back there | | | | sprocket on the front then shift between the nine |
| are nine. They are combined to produce gear ratios. | | | | gears available on the rear. |
| And today's mountain bikes have as many as 27 gear | | | | As dispensable components, gears are rather |
| ratios. | | | | important to mountain bikes. It is true that there are |
| Many people should have the chance to ride a bike. | | | | various kinds of gears for different mountain bikes. |
| When you rotate the pedals one turn, the rear wheel | | | | Gears have a close relationship with the speed, |
| would rotate one turn as well (1:1 gear ratio). The use | | | | without them, the whole bike may not function well at |
| of the gears is to allow riders to crank the pedals at a | | | | all. It can be concluded that gears are necessary parts |
| constant pace no matter what kind of slope your bike | | | | for mountain bikes. They will move the pedals and help |
| is on. | | | | you build up speed. |
| The speed of bikes is related with gear ratios. For | | | | |