Can the wheel size of a car be modified?

[LaBrianna]

Modifying the wheel size of a car is not allowed, as altering the wheels without prior approval from the traffic management authorities is illegal. If you must change the wheels, you can consult 4S staff to understand the maximum size of wheels that can be replaced, so as to choose the appropriate tires; otherwise, it may affect the annual vehicle inspection. According to regulations, any changes to the body color, model, performance, purpose, and structure of a licensed motor vehicle, including replacing the frame, body, or engine, require the owner to apply for a modification registration with the vehicle management office. The annual inspection refers to a comprehensive safety check conducted every year or every two years, covering all aspects such as the horn, brakes, axle weight, chassis, ignition system, lighting system, exhaust system, and license plate installation.

[SanGrace]

I think changing the wheel size is possible, but it needs to be done carefully. For example, I tried it on my own car before—bigger wheels looked much cooler, but problems followed. Altering the wheel size directly affects the car's performance and safety. For instance, larger wheels increase the overall tire diameter, which can make the speedometer inaccurate—showing 50 km/h when it's actually only 45, which is dangerous at high speeds. If the wheel size is too small, the thicker tires may improve comfort but reduce handling, making the car wobble badly during turns. I recommend checking local traffic regulations first—many places limit wheel size modifications to no more than 3% of the factory design, or it becomes illegal and may lead to fines or failed inspections. If the tires aren’t properly matched after modification, it can increase the risk of blowouts or brake failure. That’s why I usually go to professional modification shops—they use tools to calculate size differences and select compatible wheel and tire brands. Also, don’t forget that modifications might void the warranty, and insurance companies may raise premiums. In short, it’s doable, but take it step by step—safety first.

[OAddyson]

Of course, wheel size can be changed! As a car enthusiast myself, I often tinker with wheels for a fresh look. Upgrading to larger rims looks super cool, enhances appearance and grip, and improves stability on corners—but don’t go overboard. Changing the wheel diameter increases fuel consumption due to added weight and resistance, slowing acceleration. A drastic size difference can skew the speedometer reading too much—for example, showing 120 when you’re actually doing 100, which is dangerous on highways. I also love custom designs, opting for different materials like forged aluminum for lightweight durability. Just make sure to match the original specs: the wheel’s ET (offset) and J (width) values must align, or they’ll interfere with the braking system. Always use an online wheel calculator to simulate size changes, keeping total diameter variation within 3%, and get a wheel alignment afterward. When modding, prioritize safety and regulations—never cheap out on low-quality parts.

[AnnaAnn]

Wheel size can be changed, but modifications bring practical impacts. Size changes such as larger rims with thinner tires improve handling precision but reduce comfort; if the wheel diameter increases, the speedometer will be inaccurate, potentially leading to speeding risks. Fuel consumption is also affected: larger rims increase weight and resistance, reducing fuel efficiency. I recommend calculating the difference between the original wheel diameter and the new wheel diameter before selecting a new size, with an error margin of less than 3% being safer. The braking system must be compatible to avoid reduced braking performance after modification. Professional installation and regular inspections are necessary.