Can I Replace Just One Tire on a 4WD Vehicle?

[EmmettRose]

You can replace just one tire on a 4WD vehicle. Tire Replacement Considerations: When the puncture on the tread is only 6mm, for economic reasons, you can simply patch the tire and continue using it without replacement. This is because a metal piece inserted into the tire won’t significantly damage its structure—only creating a hole through the steel wires, fabric layers, and polyester layers, which can be repaired. Of course, replacing the tire is safer, and the damaged tire can then be used as a spare. Tire Maintenance: Rotate the tires every 10,000 kilometers to ensure even wear and prolong tire life. Avoid rapid acceleration, hard braking, or sharp turns while driving. It is recommended to perform a wheel alignment every 2,000 kilometers to reduce abnormal tire wear caused by changes in the main wheel alignment parameters. Tires are often used under complex and demanding conditions, enduring various deformations, loads, forces, and temperature extremes during operation. Therefore, they must have high load-bearing capacity, traction performance, and cushioning ability. Additionally, tires need to exhibit high wear resistance and flexibility, along with low rolling resistance and heat generation.

[DeCamila]

Last time my 4WD off-roader got a nail puncture, the mechanic absolutely refused to let me replace just one tire. He said if the wear difference between the four tires exceeds 1.5mm, the drivetrain would be fighting like twisted hemp ropes. The differential would constantly deal with rotational speed differences, and the transfer case bearings would eventually fail. After five years of mountain driving, I've developed a habit: even if only the right rear tire is punctured, I grit my teeth and replace both rear tires - after all, repairing the center differential costs more than ten new tires. By the way, if the original tires are discontinued, it's best to replace all four with the same brand and model's new version.

[DiMicah]

Last time at the 4S dealership, I witnessed a painful lesson firsthand. An Q5 owner tried to save money by replacing just one tire, and three months later, the differential started making deafening noises. The mechanic used a vernier caliper to measure and found the new tire was a full 2mm thicker than the old ones. The transfer case lubricant had turned into complete sludge. If you really must replace a single tire in an emergency, it has to be the exact same brand and model as the other three, with a production date no more than six months apart. As an experienced driver, I now carry a tire tread depth gauge in my car and measure for fun every 5,000 kilometers, ensuring the wear difference between all four tires never exceeds one millimeter.

[KingRose]

Forget about 4WD vehicles, even my front-wheel-drive car requires paired tire replacements when one blows out. Tires are like shoes on your feet - mixing old and new ones will make you limp. If the rolling radius difference between four tires is too large, even the ABS anti-lock braking system can go haywire. Not to mention hardcore off-road vehicles with differential locks, where a tire diameter difference exceeding 4% could potentially shatter the gears. Before crossing the uninhabited zone last year, I replaced all my five-year-old AT tires. The tire shop owner flipped through the bill saying it could buy two smartphones, but thinking about the scenario of the transfer case smoking in the desert, this money was well spent.