The complexity arises when the existing tires have significant mileage. On a two-wheel-drive vehicle, a brand-new tire paired with an older, worn tire on the same axle creates an imbalance. Because the new tire has a larger diameter due to its full tread, it rotates at a slightly different speed than its worn counterpart. This can cause the car to pull to one side or interfere with the traction control and anti-lock braking systems. According to experts at Consumer Reports , if your tires are more than 30 percent worn, you should generally replace them in pairs to maintain balanced handling and braking performance.
Should You Always Replace Car Tires in Pairs? - Consumer Reports can you buy just one tire
In summary, buying a single tire is a viable "patch" for a new set, but a risky gamble for an older one. When facing this choice, the best course of action is to have a technician measure the tread depth of your remaining tires. If the difference is too great, the upfront cost of a second tire—or even a full set—is a small price to pay compared to the long-term costs of uneven wear or mechanical failure. If you're dealing with a flat right now, tell me: What is the of your car? Is it All-Wheel Drive ? Roughly how many miles are on your current tires? The complexity arises when the existing tires have