But the angle of the cushion is not rigid. For example, some people often complain about crotch pain after riding, which may be caused by too much pressure on the front of the cushion. This is because the nose end of the cushion can be slightly downward adjusted, which can reduce the pressure on the crotch, especially when going uphill. On the contrary, some people don't ride uphill for a long time, but like the fun of breaking down. Because of the relationship between the center of gravity, the rider often moves back and forth between the cushion and the cushion. At this time, it's better to lean the nose end of the cushion up a few degrees, and lower the height of the seat tube, which helps the flexibility of the body on the cushion when going downhill.

Method / step 2:
seat height
The next step is to set the height of the cushion. The height of the cushion is the most important part of the bicycle setting, especially closely related to knee injury and treading strength. If the cushion is too high, the knee is easy to be injured, and the center of gravity is too high, which is also easy to cause accidents; if it is too low, the foot can not step on the strength, and long-term trampling with incorrect posture will also have a bad impact on the knee and legs. Only the right cushion height can give full play to the proper trampling efficiency, and have the most correct and healthy trampling posture without hurting the body. Besides, it can not only avoid turnip legs, but also improve the leg shape!
Knee joint is the most frequently used body part in cycling, but it is also the most vulnerable and vulnerable part. When we step on our legs every time, the knee joint will move once. Such frequent movements, if the method, direction or position of force application is not correct, it is easy to make the knee joint injured, or even unable to ride for a lifetime (many knee joint injuries are difficult to recover), so we must be careful!
How to measure the height of seat cushion (crotch length * 0.885)? In fact, if you don't want to be a player, you really don't need to make a simple thing so complicated. As long as the beginners put the "heel" on the pedal first, and then step on it a few times, slowly adjust the height of the cushion. When they reach the lowest point, their knees are just straight. At this time, the height of the cushion is eight to nine! According to this standard cushion height, put the "foot" back to the original standard position, so that the knee will naturally have a little bending at the lowest point of the treading, so that the stretching position can not only take into account the force of the treading, but also can not make the knee joint hurt when treading again. Of course, if the novice can't get used to such a high riding position at once, he can also reduce the "standard cushion height" by another one, two centimeters, or even three, four centimeters, which is still acceptable.
When setting the cushion height, the most taboo is to pull the cushion too high (there are many middle school students like to play cool on the road, deliberately pull the cushion very high, pretending that their feet are very long). Such cushion height will make the knees straight when stepping on it, which is a very dangerous action! It is necessary for legs to step and turn frequently like cycling. If the knees are straightened at this time, it will not only make the trampling have a "stop point", which will affect the continuity of trampling, but also hurt the knee joints and leg ligaments when the knees are straightened. Although there will be an illusion of "straight out" of the trampling force when the cushion is pulled high, it seems that this posture is necessary to step out, but in fact, no matter the muscle or knee joint, it is easy to wear and hurt at this time. So remember one thing! Do not let your knees straighten when riding.
The height of the cushion should not be too low. Generally, beginners are not used to the riding posture with high center of gravity, so they often pull down the height, and pull too much, so that the "squat riding" posture will make the strength of the legs unable to stretch. Although they are more comfortable when riding (because the center of gravity is low, and the sole of the foot can step on the ground), they can not stretch the legs, calves, and knees Will let you ride not fast, long time down also easy to cause muscle and joint wear.
Therefore, we suggest that you find out your "standard cushion height" first, then you can lower it a few centimeters, get used to the change of the center of gravity slowly, and then you can adjust it up a little bit (half centimeter or one centimeter) until you find a good position that can not only make you feel confident, but also give attention to the trampling force and avoid physical injury.
Method / step 3:
Front and rear seat cushion position
In fact, the front and back position of the cushion is also closely related to the knee joint, but it is often the most easily neglected section. Generally speaking, car owners or car shops often use "good-looking or not?" Or "cool or not?" It's not right to wait for appearance factors to determine the front and back position of the cushion. The front and back position of the cushion, as well as the height of the cushion, also affects the knee joint, so you must be careful when setting it.
The setting of the front and back position of the cushion is actually quite simple: first sit on the cushion, put the foot on the right position of the pedal, then step on it a few times, and then place the pedal horizontally. This is that the vertical line of the "knee point" of the front foot should just pass through the center position of the pedal (that is, the pedal axis), so it is finished! If the vertical line does not pass through the center position of the pedal, adjust the position of the cushion in turn. The seat cushion position is too far ahead, while figure C4 is too far behind. Too far ahead or behind the seat cushion position will affect the foot force of the legs, which is also closely related to the knee wear, so it should not be careless.
This position is not dead, of course, but a little elastic: if the position is a little bit more behind, it can make the thigh output better and more direct, and it is suitable for the high-powered man who likes the way of "big foot trampling"; if the position is a little bit more in front, it can dye the knee and calf to rotate more smoothly, and it is suitable for the friend who likes "she can rotate" (trampling output is smaller, but trampling Faster). But no matter forward or backward, the moving position shall not exceed the standard position by more than 2.5cm, otherwise, the knee and muscle will be injured easily.
The most common mistake a car driver makes is to put the seat cushion in the back too much, which seems to make the car look more handsome and cool. Stepping on the car seems to have the same kind of solid feeling. But the result of this hard exercise will actually hurt the knee in the long run