Can I replace just two tires on an AWD?
In practice, replacing only two tires on an all-wheel-drive vehicle is generally discouraged because it can upset the drivetrain’s balance. The safest option is to replace all four tires to keep rolling diameters consistent. If you must replace two, install the new tires on the same axle and ensure they are identical in size, brand, and model to the existing tires, and consult the vehicle’s manual or a dealer for model-specific guidance.
Why tire size and wear matter in AWD
All-wheel-drive systems rely on synchronized wheel rotation to distribute power. Differences in tire diameter cause wheel-speed sensors and the center differential or clutch to compensate, which can lead to binding, added wear on driveline components, or even false activation of safety systems. Matching tires helps ensure predictable handling and reduces stress on the drivetrain.
How AWD systems use wheel-speed sensors and the center differential
Most AWD or 4WD setups use a center differential or an electronically controlled clutch to transfer torque. When one wheel’s circumference differs from the others, the system detects a speed discrepancy and adjusts torque, which can strain the drivetrain if the mismatch is large or persistent.
What circumference differences do to AWD
A mismatch in rolling circumference translates into the perception of slip and can trigger torque distribution changes that stress hubs, differentials, and the transmission. Even small differences, if persistent, can accumulate wear. That’s why manufacturers emphasize matching tires by size, tread depth, and model.
Replacing Two Tires: options and guidelines
The following options cover common paths people take when AWD owners need to replace only two tires. The specifics can vary by vehicle, so always confirm with the manual or a tire professional.
- Replace all four tires to guarantee identical rolling diameters across every wheel; this eliminates a major source of drivetrain imbalance and is the simplest path for most AWD vehicles.
- If you replace only two tires, mount the new pair on the same axle (often the rear, per safety guidance) and ensure the two remaining tires on the other axle are as close in diameter and tread depth as possible; use identical brand, model and size for the new tires and the existing tires on the other axle.
- Avoid mixing tire brands, tread patterns, or sizes; significant differences can confuse the AWD system and stability-control systems.
- Check the vehicle’s manual about any warranty or service bulletin implications; some AWD systems require software updates or recalibration after a two-tire replacement.
In practice, many drivers find that replacing all four tires is the most straightforward way to maintain AWD performance and safety. Two-tire replacements are a compromise and carry additional risk if not done carefully.
Manufacturer Guidance and Practical Advice
Guidance varies by make and model. Some manufacturers require four new tires at minimum, while others permit two, provided the tires are the same size, brand, and model and installed on the same axle. Always start with the owner’s manual or a dealer’s service department and consult a tire professional when in doubt.
When to consult a dealer or tire shop
If your AWD system uses a speed-based coupling or has special calibration, your dealer or a qualified tire shop can confirm whether a two-tire replacement is acceptable and whether any software updates are needed after replacement.
Summary
Replacing two tires on an AWD vehicle is possible in some circumstances, but it is not the default safe option. The primary goal is to keep wheel diameters as uniform as possible to protect the drivetrain and maintain predictable handling. If possible, replace all four tires; if not, ensure exact tire specifications, correct axle placement, and follow manufacturer guidance with professional input.
Do you have to replace all tires on an AWD if one is bad?
Mismatching Tires May Cause Damage to Your AWD Vehicle
Replacing just one or two tires on an AWD vehicle could cause unnecessary wear and tear on your drivetrain, or confuse the traction control system to think that you are frequently losing traction.
Can I replace just two tires on an all-wheel drive car?
If you are looking to replace all-wheel drive tires, we recommend replacing all four at once.
Can you put a spare tire on an AWD?
Using a spare tire for an extended period can create imbalances in the AWD system, leading to potential damage. Even if the spare tire is the same size as the other tires, it's likely that the tread wear is different.
Do all four tires need to be the same on 4WD?
Mixing tire brands, tread designs and tread depths may cause components in the vehicle's driveline to fail." This necessitates that four-wheel drive and all-wheel drive vehicles use tires that are very closely matched.
