All-wheel-drive (AWD) systems are designed to distribute power to all four wheels, which enhances traction, handling, and safety in various driving conditions. While this makes them ideal for rainy days, snowy roads, and even light off-road use, it also means the tires must work together in harmony. Unlike two-wheel-drive vehicles, where the front or rear tires handle most of the power, AWD systems distribute torque evenly or as needed. If one tire is different in size, tread depth, or wear, it can create mechanical stress throughout the drivetrain.
What Happens If You Replace Only One or Two Tires
It may be tempting to replace only the tires that look worn, especially when you’re trying to save money. However, on an AWD vehicle, even small differences in tire size can cause problems. A new tire typically has deeper tread than older ones, which makes its rolling circumference slightly larger. When one tire rotates at a slightly different speed than the others, the AWD system interprets it as a loss of traction and compensates by transferring power. Over time, this constant correction can damage expensive parts such as the differential, transfer case, or transmission.
The Cost of Ignoring Tire Uniformity
Ignoring tire uniformity doesn’t just put stress on your AWD system. It can also lead to reduced fuel efficiency, uneven handling, and premature tire wear. Your car may pull to one side, feel less stable during turns, or produce unusual noises from the drivetrain. Repairs caused by mismatched tires often cost far more than replacing all four tires at once. For example, a damaged transfer case or differential repair can easily reach thousands of dollars, compared to the cost of four new tires.
When Replacing Two Tires Is Acceptable
In certain cases, replacing only two tires on an AWD vehicle may be acceptable, but it depends on tread depth. If your existing tires are still relatively new and the tread difference is less than 2/32 of an inch, a technician may recommend replacing only the most worn pair. Another option is tire shaving, a process where a new tire is machined down to match the tread depth of the remaining ones. This approach is less common but can be a cost-saving solution when only one tire is damaged and the others are still in good condition.
How to Extend the Life of Your Tires
Replacing all four tires at once can be expensive, which is why it’s worth taking steps to extend their lifespan. Regular tire rotations ensure that wear is evenly distributed across all four corners of your vehicle. Keeping your tires properly inflated also prevents unnecessary strain and reduces the risk of uneven wear. Wheel alignments, performed at least once a year, help maintain proper contact between the tires and the road. By following these simple steps, you maximize the life of your tires and delay the need for a full set replacement.
Why AWD Tire Care Is Different From 2WD
Many drivers who switch from a standard two-wheel-drive car to an AWD vehicle underestimate how much more sensitive the system is to mismatched tires. On a front-wheel-drive vehicle, for instance, it’s common to replace two tires at a time without any issues. But in AWD vehicles, because power is constantly distributed to all wheels, the margin for error is much smaller. What might be a minor inconvenience on a two-wheel-drive car can quickly become a costly repair on an AWD system. This is why professional advice is so important whenever you’re making tire decisions for an AWD vehicle.
Keep Your AWD Reliable With Central Automotive Service Center
When it comes to tire replacement, the safest option for AWD cars is almost always replacing all four at the same time. At Central Automotive Service Center in Walnut Creek, CA, we can measure your tread depth, evaluate your current tires, and recommend the most cost-effective solution for your vehicle. Our team also handles rotations, alignments, and balancing to help your tires last longer and keep your AWD system running smoothly.
Schedule your appointment today and drive with confidence knowing your tires are working together the way they should.