Do Subaru tires have to match?
Yes, for Subaru models equipped with all-wheel drive, it is best practice to use four matching tires across all corners. Mismatched tires can disrupt the AWD system’s torque balance and handling, so owners are advised to fit a full set of identical tires whenever possible. If you must mix tires, keep the overall diameter differences small and try to match brand and model as closely as possible.
How Subaru's all-wheel-drive system works
Subaru’s Symmetrical All-Wheel Drive uses a center differential to distribute power between the front and rear axles. This design assumes similar tire sizes and tread depths on all wheels. When tires differ in diameter or grip, the system can compensate in ways that stress drivetrain components, alter torque distribution, and affect stability and braking performance, especially in low-traction conditions.
Why tire matching matters on Subaru
Tire matching helps preserve the intended balance and response of the AWD system. Differences in circumference or tread depth can lead to unequal torque transfer, increased wear on the center differential, and unpredictable handling during cornering, acceleration, or braking. On winter or slippery surfaces, the impact is more noticeable, making full-tire matching an important reliability factor for Subaru drivers.
Guidelines for matching tires on Subaru
Use these guidelines to decide how to replace or rotate tires on a Subaru with AWD.
- Replace all four tires at once to ensure identical diameter and tread depth.
- If replacing only two tires, mount them on the axle with less wear and strive to pair them with tires that are as similar as possible in size, brand, and model on the other axle.
- Use tires of the same size, brand, model, and tread pattern on all four corners when feasible.
- Keep the overall tire diameter difference between any two tires within about 2% (1% or less is preferable).
- After changing tires, have the vehicle aligned and balanced; consider a tire rotation schedule aimed at even wear on AWD Subarus.
Conclusion: Adhering to these practices helps maintain AWD performance, traction, and drivetrain longevity on Subaru vehicles.
Special cases: winter tires and different brands
Winter tires can be beneficial for cold months, but mixing seasons or brands is more risky on AWD. If you use dedicated winter tires, aim for a full set of matching winter tires or ensure the diameter difference with your summer tires remains within the recommended margin. When in doubt, consult your Subaru owner's manual or a dealership service department for model-specific guidance.
What to do if you already have mismatched tires
If you currently run mismatched tires, minimize further changes until you can replace tires to restore uniform circumference and tread depth. Schedule an alignment check, monitor tire wear, and consider replacing the least similar tires first to approach a full matching set as soon as possible.
Summary
Subaru’s all-wheel-drive system benefits from four matching tires. A full set of identical tires is the simplest way to maintain optimal torque distribution, traction, and reliability. If replacement is unavoidable in pairs, prioritize matching size, brand, model, and tread depth, and keep diameter differences within a tight margin. Always consult the owner’s manual or a Subaru service professional for model-specific recommendations.
