Should I Replace Two or Four Tires?

[VanLayla]

Tire replacement guidelines do not strictly specify whether to change two or four tires. The decision should primarily be based on practical circumstances. When conditions permit, it is recommended to replace all four tires simultaneously. Typically, at least the two tires on the same axle should be replaced together. Replacing only one tire can result in different tread patterns on either side of the vehicle, increasing fuel consumption and posing numerous safety risks. Tires are circular elastic rubber products mounted on various vehicles or machinery for ground contact and rolling. They are usually installed on metal rims to support the vehicle body, absorb external shocks, maintain contact with the road surface, and ensure driving performance. Tires often operate under complex and demanding conditions, enduring various deformations, loads, forces, and extreme temperatures during use. Therefore, they must possess high load-bearing capacity, traction performance, and shock absorption capabilities.

[VonAlex]

When it comes to changing tires, I've been driving for over 20 years and have seen many friends only replace two to save money. But honestly, it's generally recommended to replace all four. Why? Uneven tire wear is a major issue. If you only replace two new tires, the deeper wear on the old ones can cause uneven braking force, making the car prone to skidding in winter or rainy weather. Especially for four-wheel-drive or front-wheel-drive vehicles, placing new tires on the front while the rear tires are heavily worn can make the car unstable. To check tread depth, insert a coin—if it's less than 2mm, it's time to replace them. Replacing all four ensures smoother driving, extends tire lifespan, reduces repair costs, and is more cost-effective and safer in the long run. At least check the condition every two years.

[Ashlyn]

As a newly licensed driver, I've discussed this issue with my buddies. Replacing just two tires sounds cost-effective – say, a new pair for two or three hundred bucks, half the price of replacing all four. But after actually doing it, I found that last time when I only changed the two front tires, the car started shaking at highway speeds, which was pretty unnerving. Research shows that significant differences between old and new tires can affect handling, and uneven tire grip increases the risk of blowouts. Though saving money is tempting, I now lean towards replacing all four, especially when the rear tires are heavily worn. My advice: measure the tread depth of the old tires – if it's within 2mm, it might be okay; otherwise, don't take the risk. Safety first.

[VonZane]

From a vehicle system perspective, tires are crucial for dynamic performance. Replacing only two tires is unreasonable: new tires have strong grip while old tires have weak grip, which can lead to braking imbalance or steering instability, easily triggering ABS or ESP faults. Especially on slippery roads, the risk doubles. During inspection, compare the wear depth. If the difference is significant, replace all four tires without hesitation. This ensures even grip and low rolling resistance—safety first.