Does Subaru recommend replacing all 4 tires?
Yes. For Subaru models equipped with Symmetrical All-Wheel Drive, replacing all four tires is the standard recommendation when tires are worn or you’re replacing tires due to wear. If you can only replace two tires, follow guidance to minimize drivetrain stress by placing the new tires on the rear axle and replacing the remaining tires as soon as possible to keep tread depth balanced.
Subaru's owner manuals and service notes emphasize maintaining equal rolling circumference across all four wheels to prevent torque bias that can affect handling, grip, and the AWD system. Because tires wear at different rates depending on usage, many drivers end up needing all four tires replaced to restore even traction. When two tires must be replaced, the general advice is to install the new tires on the rear axle to preserve stability, and to replace the other two promptly. Always use the correct tire size and rating, and consider a rebalancing or alignment check after replacement. Note: The guidance above mainly applies to Subaru models with Symmetrical All-Wheel Drive; the BRZ is rear-wheel drive, so AWD-specific recommendations do not apply there.
Guidance for tire replacement on Subaru AWD
Guidance from Subaru and tire professionals typically centers on matching tread depth and maintaining equal circumference across all wheels on AWD vehicles. Below are common practices you may encounter when evaluating tire replacement options.
- Replace all four tires when the current tires are worn to or near the legal limit or when you want to restore identical tread depth and circumference across all wheels.
- If replacing only two tires is unavoidable, install the new tires on the rear axle and replace the remaining tires soon after to restore even wear; ensure the tires are the same size and type as the vehicle's requirements.
- Avoid mixing tires of different brands and sizes on an AWD Subaru; if you must mix, ensure identical size and closely matched tread depth, and consult a dealer or tire professional.
- After replacing tires, have a vehicle inspection that may include wheel alignment, balancing, and, if applicable, recalibration of the tire pressure monitoring system (TPMS).
Concluding: The safest approach for AWD Subarus is to replace all four tires to maintain uniform grip and prevent drivetrain torque differences. If replacing all four at once isn’t possible, prioritize replacing two and install them on the rear while matching tread depth as closely as possible, then schedule a full replacement at the earliest opportunity.
Summary
For Subaru models with Symmetrical All-Wheel Drive, replacing all four tires is the preferred approach to preserve performance and drivetrain protection. If two tires must be replaced, install the new ones on the rear axle and replace the other two soon after, ensuring identical tire size and close tread depth matching. Always consult your owner's manual and a Subaru dealer or tire professional for model-specific guidance.
