Can the wheel size of a car be modified?
2 Answers
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.
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.
