The correct measurement method:
The position of the car seat can be divided into three dimensions: height, front and rear angles.
Let's look at the height measurement first. First, measure the length of your seat and find the center position of your seat. For example, if your seat length is 27cm, then the center position is 13.5cm behind the seat tip. Make a mark.
Then we take this center point as the starting point, and measure the position of the five-way center. Generally, it is better to find a hollow part on one side for measurement. And record it. This is the height of your real car seat.
The confirmation of the front and rear positions of car seats is influenced by many aspects. If you are used to your original seat position, but want to get a new seat, you can locate the front and rear positions of your new car by this method.
First, find a wall to keep the rear wheel of your car close to the wall, then measure the distance A from the wall to the five-way, and then measure the distance B from the wall to the seat top again.
A-B is equal to the distance between your car seat and Wutong, that is, the position where you need to install your new car seat. Of course, that's why the horizontal distance of the upper pipe can't really reflect your forward extension, because the proper saddle position and the relative position of your five-pass have not changed. The real forward extension is the horizontal distance from the five-pass to the head pipe. The details can be understood by Baidu, and will be specifically mentioned in future programs.