
The small round mirror should be stuck on the inner side of the rearview mirror. Rearview mirrors can be categorized by their installation positions: central rearview mirror, left rearview mirror, and right rearview mirror. The functions of the small round mirror are introduced as follows: Reduce Blind Spots: During daily driving, due to certain blind spots in the line of sight, it is often impossible to see some situations on adjacent roads, such as when a vehicle behind overtakes or makes a U-turn. These situations can create blind spots. Installing a small round mirror can expand the field of vision and reduce blind spots on the right rear side of the vehicle. Expand Field of Vision: When the driver sits in the cab, they generally cannot see the situation on the sides and rear of the vehicle. After installing a small round mirror, the driver's viewing angle can be increased, allowing clear visibility of the rear wheels when reversing.

I've been driving for over a decade, and the placement of small round mirrors is quite particular. It's best to stick them on the outer lower corner of the rearview mirrors—the left mirror on the bottom left corner and the right mirror on the bottom right corner. This way, you can clearly see the position of the rear wheels and the roadside curb. If placed too low, it may block your normal view, while placing it too high makes it hard to see the wheels. After sticking them, remember to sit in the driver's seat and adjust the angle so that the edge of the rear wheel just appears in the small round mirror. During rush hour traffic jams, this small angle helps me easily avoid curbs, makes parallel parking a breeze, and gives me extra confidence when navigating narrow alleys.

As a new driver who got my license six months ago, blind spot mirrors are truly a godsend. I went through three sets before figuring out the perfect placement: bottom left corner for the left mirror, and bottom right corner for the right mirror. Initially, I placed them too close to the center which blocked my view while reversing, but when positioned too far out, visibility was poor. Now I always check the mirrors before driving to ensure they're adjusted just right to see the rear tire edges. Installing them at night even helps prevent wheel rim scratches from curbs, saving me a lot on touch-up paint. I've even gained confidence to reverse in rainy conditions without worrying about crossing lines anymore.

The placement of small round mirrors directly affects the field of vision. The upper left corner is suitable for observing distant oncoming vehicles but is almost useless when reversing; the lower left corner can monitor the trajectory of the rear wheels, essential for parallel parking. The upper right corner can expand the rear view, while the lower right corner specifically tackles the right-side blind spot. Most people choose to place them on the lower left and lower right: the left side allows visibility of the rear tire contact position, and the right side can avoid the blind spot for electric vehicles. Misplacement renders them ineffective, so it's recommended to first simulate the position with a handheld mirror before sticking, ensuring no overlap or obstruction of the field of vision when seated in the driver's position.

Installing a small round mirror involves four steps: First, clean the mirror surface of any oil film using an alcohol wipe, avoiding touching the adhesive side. For the left mirror, place it in the lower-left quarter area; for the right mirror, the lower-right quarter. When peeling off the protective film, gently press the center to avoid air bubbles. Return to the driver's seat, start the car, and slowly adjust the mirror angle until the rear tires come into view. I prefer fine-tuning during reverse parking: keeping the wheels 30 cm from the curb is ideal. Placing it too high can distract, while too far outward risks detachment. Correct positioning ensures durability for three to five years.

A common mistake is randomly sticking them on either side. Some people place the left one at the upper right corner, resulting in glare; others stick the right one at the lower left corner, leaving blind spots completely unimproved. The worst is placing it in the middle—when reversing, it becomes impossible to distinguish the mirror image. I've seen some attached to the mirror frame edges, only to fall off after a few bumps. The correct position must be symmetrical: the left one exclusively monitors the left rear wheel from the lower left corner, while the right one tracks the right rear wheel's path from the lower right corner. Misplacement doubles blind spots, increasing the risk of scraping curbs during narrow-road encounters, which could lead to costly wheel rim or tire sidewall damage.


