Should the Rearview Mirror Show the Tires?

[VonBethany]

The rearview mirror does not need to show the tires. It is recommended to adjust the right rearview mirror slightly outward to ensure visibility of the car body while also capturing more of the space to the right rear. Many vehicles have a blind spot about 1 meter outside the right rear door. Installing a blue-tinted mirror can help expand the field of vision. Below is relevant information: 1. Rearview mirrors are tools that allow drivers to directly obtain information about the rear, sides, and lower parts of the vehicle while seated in the driver's seat. For the convenience of the driver and to prevent traffic accidents and ensure personal safety, all countries mandate the installation of rearview mirrors in vehicles, and all rearview mirrors must be adjustable. 2. Rearview mirrors involve the concept of a field of view, which refers to the range that the mirror surface can reflect. The industry mentions three key elements of the field of view: the distance between the driver's eyes and the rearview mirror, the size of the rearview mirror, and the radius of curvature of the mirror. These three elements are interrelated. When the distance and size of the rearview mirror are the same, a smaller radius of curvature of the mirror surface results in a larger reflected field of view. Similarly, when the radius of curvature is the same, a larger mirror size provides a wider reflected field of view.

[VonAiden]

As a veteran driver with over 20 years of experience, I suggest not deliberately adjusting rearview mirrors to see the tires. The primary purpose of mirrors is to clearly observe the situation in the rear lanes, especially the blind spots at an angle behind you. Many beginners feel reassured when they can see the tires, but this actually narrows your field of vision. For example, when turning, you need to pay attention to the movements in adjacent lanes. If the mirror is adjusted too low, you might see the rear wheels, but the car accelerating to overtake from behind could enter the blind spot. My friend who works at a repair shop often says that at least 70% of scraping accidents happen because drivers only focus on the nearby tires and fail to notice the actual vehicles approaching from behind. The adjustment principle is simple: just expose a quarter of the car body, with the focus on covering the fan-shaped area to the side and rear.

[McJonathan]

After teaching driving for so many years, my mirror adjustment method is: the car body should occupy one-third of the mirror surface, with the horizon as the central line in the field of view. It's not necessary to expose the tires; the key is to eliminate blind spots. Nowadays, students often make the mistake of setting the mirrors too low, focusing entirely on their own tires when changing lanes. With the correct adjustment, you should be able to see at least two lanes in width, even spotting electric bicycles behind you in advance. Especially when driving high-ground-clearance vehicles like SUVs, deliberately aiming at the tires can cause the mirrors to lose their ability to capture distant road conditions. Remember, mirrors are extensions of your eyes, not tools for checking tire pressure.

[MadelynMarie]

There's no fixed answer to adjusting rearview mirrors. In my sports car with very low seats, it's natural to see a small portion of the tire in the mirror; while in my high-seated MPV, the tires are completely invisible. The key is to adjust according to vehicle characteristics: for coupes, align the horizon with the mirror's upper edge to maintain distant visibility while using tire visibility to gauge lateral distance; MPVs require outward mirror adjustment to eliminate rear blind spots. Practical tests show that seeing tires does help judge vehicle position, but shouldn't compromise primary visibility. Here's a tip: during adjustment, stare at the mirror while a friend walks sideways two meters behind the car - the moment they disappear from view marks your true blind spot.

[EvaDella]

Looking at the test data from automotive engineers reveals that the theoretically optimal tilt angle for rearview mirrors is when the car body occupies 12%-25% of the mirror's width. At this angle, the tires of ordinary sedans are unlikely to appear in the view, but blind spots during lane changes can be reduced by 65%. There are only two situations where focusing on the tires is truly necessary: first, when reversing in tight spaces to judge the distance from the curb using the tires, and second, when checking for abnormal tire pressure (though this is an unconventional need). For daily driving, if you insist on adjusting the mirror to see the tires, the blind spot on the right side can expand from 15 degrees to nearly 30 degrees, making it more dangerous when encountering suddenly changing electric bikes. Remember, the most scientific position is when the lower edge of the mirror just shows the rear door handle.

[StKarter]

Friends who are into car modifications know that models with blind spot monitoring now have preset angles for the rearview mirrors. After disassembling dozens of systems, it's clear that factory settings never require the tires to be visible. Those additional small round mirrors are the dedicated tools for checking the tires. For regular car owners, adjusting the mirrors follows three standards: First, while seated in the driver's position, the entire rear window should be visible. Second, there should be no blind spots within a 75-degree angle to the side and rear. Third, the movement trajectory of distant vehicles should be clear. If quantification is necessary, adjust the left mirror to just not see the edge of your own car, and leave about a palm's width of the car body visible on the right side. After all, staring at your own wheels while driving is as odd as only looking at your own instep in a photo.