If it is a left rearview mirror, the reversing small round mirror is generally installed in the position shown in the figure. Because the left rearview mirror is generally used for reversing or overtaking, domestic parking is on the right side, which is rarely seen when parking, so the position of the small round mirror for reversing should reduce the blind area of the rearview mirror as much as possible, and at the same time, the rear wheel can be seen.

Finally, the right rearview mirror, as shown in the figure, will mostly choose 7, 9 and 3. If they are good or bad, these positions are obvious. Position 7 can bring a larger view to the rearview mirror, which plays an important role in overtaking and merging, but there will still be some occlusion; Position 9 allows you to grasp the distance between the wheel and the roadside when parking, but it largely blocks the field of vision; A good position can also help you grasp the distance between the wheel and the roadside when parking, but it will seriously affect your vision. Generally speaking, the best position is position 7, and then position 9. As for which position to choose, it still depends on which one the owner is used to.