All-wheel-drive vehicles generally benefit from four matching winter tires, and many AWD systems require the tires to remain within specific rolling-circumference tolerances. Installing one new tire alongside three significantly worn tires may create handling differences and, on some vehicles, place additional stress on drivetrain components. AWD winter tires should therefore be selected and replaced according to the vehicle manufacturer’s specifications, not simply based on whether the tires fit the wheels.
Why All-Wheel Drive Does Not Replace Winter Tires
All-wheel drive distributes driving torque between the front and rear wheels. Depending on the vehicle, the system may direct power between axles or individual wheels to help maintain traction. That can be useful when accelerating from a stop on snow or climbing a slippery incline.
However, AWD does not give a vehicle additional tire grip when braking.
When you apply the brakes, your stopping performance depends heavily on the traction available between the tires and the road. Similarly, AWD cannot prevent a vehicle from sliding through a corner when the available tire grip has been exceeded. Winter tires are designed to retain flexibility in colder temperatures and use tread patterns intended to improve performance in winter conditions.
Transport Canada recommends installing winter tires in sets of four for improved control and stability. A front-wheel-drive vehicle equipped with suitable winter tires may brake or corner more effectively on a slippery surface than an AWD vehicle equipped with tires that lack appropriate winter traction. Actual results depend on conditions, the vehicles and the tires being compared.
Do All Four AWD Winter Tires Need to Be the Same?
For most AWD vehicles, four matching tires are the preferred arrangement. Matching should include the correct size, compatible construction, appropriate load and speed ratings, and similar tread patterns and wear. The purpose goes beyond keeping the tires looking identical.
Tires with substantially different dimensions can rotate at different speeds while the vehicle is travelling in a straight line. A drivetrain is designed to accommodate normal differences in wheel speed, particularly when cornering. However, continuous differences caused by mismatched tire rolling circumferences may create additional work for certain AWD components.
Depending on the system, this may involve differentials, electronically controlled clutches, transfer components or other drivetrain hardware. Not all AWD systems have the same sensitivity. For that reason, tire matching should follow the vehicle manufacturer’s specifications rather than a general rule applied to every vehicle.
Why Tire Tread Depth Matters on AWD Vehicles
As a tire wears, its overall diameter decreases slightly. A new tire with substantially deeper tread can therefore have a different rolling circumference than an otherwise identical worn tire. Even when the size markings match, the tires may not rotate at precisely the same speed.
Some AWD manufacturers specify a maximum permitted difference in tread depth, circumference or tire condition. Those requirements should be verified for the exact model and year. Different tire brands can also have different actual dimensions even when they display the same nominal size.
This is why replacing a single damaged tire deserves more consideration on an AWD vehicle. It is also why measuring tread depth during professional tire service is useful before selecting replacements.
Can You Replace Just One Winter Tire on an AWD Vehicle?
Sometimes, but the answer depends on the existing tires and the vehicle. Suppose a winter tire is damaged by a road hazard, but the other three were installed recently and have very little wear. A matching replacement may be suitable if its size, construction and rolling circumference meet the manufacturer’s permitted tolerances.
Now consider the same damage occurring when the other three tires have lost a substantial amount of tread. Installing one completely new tire could create an unacceptable difference. Possible solutions may include replacing all four tires or, where appropriate and permitted, using a professionally matched tire.
In some circumstances, a specialist may be able to shave a new tire’s tread to match the existing set. This is a specialized option that is not suitable or available in every situation. The decision should be based on actual measurements and vehicle specifications. Replacing all four tires unnecessarily adds cost. Replacing only one without checking compatibility may create a different and potentially more expensive problem.
What If Only Two Winter Tires Are Worn?
Replacing two tires is not automatically appropriate for every AWD vehicle. If the remaining pair has considerably different tread depth, the vehicle may still have a mismatch between axles. A technician should measure all four tires and confirm what the vehicle manufacturer permits.
Tire condition must also be considered. Two tires may have adequate tread but show cracks, irregular wear or other defects that affect their suitability. The safest recommendation is based on the full set rather than the condition of one axle alone.
On vehicles where replacing two is permitted, tire placement should also follow manufacturer and tire-industry guidance to maintain predictable handling.
Are All-Weather Tires Enough for an AWD SUV?
All-weather tires can be an option for some AWD drivers, particularly when they carry the three-peaked mountain and snowflake symbol. That symbol indicates the tire meets specified snow traction requirements. However, tire models vary considerably in braking performance, ice traction, tread design and handling.
A severe-snow-rated all-weather tire is not necessarily equivalent to a dedicated winter tire in every winter condition. The decision should reflect the driver’s routes and typical conditions. For someone regularly driving early in the morning, travelling outside Toronto or encountering icy secondary roads, a dedicated winter set may offer advantages.
For another driver with lower mileage and predominantly cleared urban routes, a suitable all-weather tire may be worth discussing. All-wheel drive does not change the need to select tires for the conditions in which the vehicle will actually operate.
Are EVs and AWD Crossovers Different?
Electric vehicles and AWD crossovers can have additional considerations. Vehicle weight, torque delivery, tire load ratings and manufacturer-approved tire specifications all influence tire selection. Some electric vehicles use staggered tire arrangements, meaning the front and rear tires have different sizes. Others require particular load ratings or specifications for their wheels and tires.
A replacement should not be chosen solely because the advertised tire size appears correct. McNally Auto’s Tesla wheel, tire and brake services are relevant to drivers who need guidance on compatible tire maintenance for those vehicles. The same principle applies to other AWD crossovers and SUVs: check the actual vehicle requirements first.
What to Check Before Installing AWD Winter Tires
A fall appointment should include a review of all four tires.
The technician should check:
- Tire size and compatibility
- Remaining tread depth
- Differences in wear across the set
- Tire age and visible condition
- Correct load and speed ratings
- Damage to the tread or sidewall
- Appropriate inflation pressure
- Vehicle-specific AWD requirements
If one tire needs replacement, ask whether the remaining three are within the manufacturer’s allowable limits.
Winter tires should also be evaluated for traction suitability, not only drivetrain compatibility. Transport Canada recommends avoiding winter tires with less than 4 mm of tread for snow-covered roads. A technically compatible tire set still needs enough tread and suitable rubber condition for winter driving.
Prepare Your AWD Vehicle for North York Winters
AWD can be helpful when North York roads become slippery, but it is no substitute for suitable tires. The fall tire changeover is a useful time to check tread depth, identify mismatched tires and address damage before colder weather arrives.
McNally Auto provides tire maintenance and replacement services for drivers in North York. If one winter tire has been damaged or your set has worn unevenly, arrange an inspection before purchasing a replacement. You can also review McNally’s article about seasonal winter tire performance to understand how temperature affects tire use.
The objective is to select a set that meets your vehicle’s mechanical requirements while providing dependable winter traction.
Frequently Asked Questions
Do I need winter tires if my SUV has all-wheel drive?
AWD helps distribute power during acceleration but does not create additional braking grip. Four suitable winter tires can improve traction and control in cold, snowy and icy conditions.
Can one new tire damage an AWD system?
A tire with a significantly different rolling circumference can create problems for certain AWD systems. Whether one new tire is acceptable depends on the vehicle’s specifications and the condition of the other three tires.
Do AWD tires have to be the same brand?
Using four matching tires is generally preferable because models can differ in construction, traction and actual dimensions. A substitute tire should only be selected after checking the manufacturer’s compatibility requirements.
Can I use two winter tires and two all-season tires on an AWD vehicle?
Mixing seasonal tire types can produce unpredictable handling and traction differences. Transport Canada recommends installing winter tires in sets of four.
Are all-weather tires suitable for an AWD vehicle?
Some all-weather tires are suitable when they meet the vehicle’s requirements and the driver’s winter conditions. Their performance should be evaluated by model rather than assuming all products offer the same snow and ice traction.
