Do you know how to change gears when riding a road bike?
As a road bike novice, in addition to understanding the riding posture of various road bikes, the most troublesome thing should be how to operate the speed change system of road bikes, and under what circumstances do we need to change gears? With these questions in mind, Xiao Bian will take you to understand some of the most basic concepts and operations in road vehicle transmission today.
I hope it can help some new road vehicles who just entered the pit.
When a novice road vehicle gets a new bicycle, he should first know how fast the speed change of the vehicle can be.
That is to say, look at the product of the number of discs of the road vehicle tooth disc and flywheel.
Tooth disc refers to a number of large discs connected to the crank on the right side of the bike, and flywheel refers to a number of small discs connected to the rear wheel flower drum on the right side of the bike.
What is the speed of highway vehicles.
In the final analysis, the gearshift of road vehicles is to adjust the gear ratio.
If your road vehicle has 2 discs and 11 flywheels, you can provide 2×11=22 gear ratios.
However, it does not necessarily have 22 gearshifts.
It is likely that the same gear ratios will occur due to different disc combinations.
As shown in the figure below, three gear ratios appear twice.
Although they are composed of different discs, the gear ratios are almost the same, so there is no difference in riding experience.
So the speed change effect that can be achieved is actually only 19 speeds.
The gear ratio of the bicycle has been mentioned previously.
The gear ratio is one of the most important concepts in the concept of speed change.
The gear ratio represents the number of times the wheel rotates when the crank or pedal rotates for one circle.
If the tooth ratio of your current tooth plate and flywheel is 3, it means that when you step on your foot for a circle, the wheels of your bike will rotate for three circles.
In this way, when the stepping frequency is fixed, the higher the gear ratio is, the faster the speed will be.
On the contrary, the lower the gear ratio is, the slower the speed will be.
However, the greater the gear ratio is, the more difficult it will be.
The smaller the gear ratio is, the easier it will be.
Front transmission Front transmission is a device for adjusting the chain position on the road vehicle tooth plate.
The front transmission is usually adjusted according to the number of discs of the dental disc.
If there are two discs, the front transmission can only convert the chain from a large disc to a small disc, or from a small disc to a large disc.
The specific adjustment method will depend on the specific transmission brand.
Although the adjustment method is different, the effect of speed change is the same.
In other words, adjust the chain to a larger gear ratio and a smaller gear ratio.
That is why we often say that “the big market is on the level road, and the small market is on the slope”.
In addition, the front transmission is usually adjusted by the left hand.
Rear transmission Rear transmission is a kind of bicycle transmission that many novices know, and it is also the most frequently operated transmission.
It is usually the operation of adjusting the chain on the flywheel.
The flywheel will be composed of a group of discs of different sizes.
The rear transmission will adjust the chain from the large flywheel to the small flywheel in turn, and vice versa.
According to the concept of gear ratio, the gear ratio of the chain adjusted to the large flywheel is smaller, and the gear ratio adjusted to the small flywheel will gradually become larger.
In addition, the rear transmission is usually adjusted by the right hand.
Keep stepping when changing speed.
When we change the speed, the speed change system needs to change the position of the chain on the disc to change it.
Only by stepping on the force and conduction, can the chain hang on the new tooth disc or flywheel.
And we need to change the speed when the right foot is at the top of the pedal.
When the right foot steps forward, the conduction caused by stepping will more easily hang the chain on the new gear plate.
In this way, the speed change is most effective, and the impact and loss on the chain and speed change device are also minimal.
Do not cross the chain to avoid the state of large front and small back or small front and small back.
Neither of these two combinations provides an efficient gear ratio, and it is easy to cause that the chain and the riding direction are not on the same horizontal plane, which will lead to uneven stress on the chain, and it is easy to break the chain or wear the accelerating gear change device, so remember not to choose the cross chain.
Anticipate the road conditions in advance When riding, the road conditions are ever-changing.
It is necessary to change the speed frequently according to the road conditions, and predict in advance according to the road conditions, and change the speed in advance.
For example, when climbing on the road, if you ride with a relatively large gear ratio, the pedal frequency will naturally slow down, resulting in the condition that you can’t step on it.
Therefore, it is better to adjust the transmission to a small gear ratio in advance before entering the slope, so that you won’t have much difficulty riding.
Many people can only use the rear transmission when the front and rear transmissions are combined.
In fact, only when the front and rear transmissions are used together can they play a greater role.
If the road conditions ahead do not change much, such as gentle slopes or simple ups and downs, it is only necessary to adjust the rear transmission to achieve more efficient transmission.
If the road conditions change greatly, such as a sudden large uphill, you can use the combination of front and rear speed changes to choose a suitable gear ratio for riding.
However, when changing speed, control the sequence to adjust.
Generally, adjust the front speed first, and then the transmission is more appropriate after adjustment.
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