Should You Replace Two Tires or All Four? (Including AWD)

The Short Answer

Replacing all four tires at once gives the most even grip and handling, and it's the safest choice for winter tires. On many front- or rear-wheel-drive vehicles you can replace just two, as long as they match the other pair in size and type, and the new pair is usually installed on the rear axle for stability. All-wheel-drive vehicles are different: many need all four tires to be closely matched in tread depth, so replacing one or two can mean replacing all four. Check your owner's manual.

When Replacing Two Tires Is Fine

• Your vehicle is front- or rear-wheel drive, not all-wheel or four-wheel drive.
• The other two tires still have plenty of tread and are in good condition.
• The new pair matches the old pair in size, type (all-season, all-weather or winter), load index and speed rating — ideally the same model.

Where do the two new tires go? Tire manufacturers generally recommend putting the new pair on the rear axle, even on front-wheel-drive cars. Deeper tread at the back helps prevent the rear of the car from sliding out on wet or slushy roads, which is harder for most drivers to control than the front pushing wide.

Why AWD Vehicles Are Different

An all-wheel-drive system expects all four tires to turn at almost the same speed. A new tire is slightly larger in diameter than a worn one, so mixing new and worn tires makes the wheels turn at different speeds, and the system works constantly to make up the difference. Many manufacturers set a maximum allowed difference in tread depth between tires on AWD vehicles. That's why replacing a single damaged tire on an AWD car often means replacing all four, unless the other three are still nearly new.

Your owner's manual will list the rule for your vehicle. If you're not sure, bring it in and we'll measure the tread on all four and tell you your options.

Can You Mix Different Tire Brands?

• On the same axle: no. Both tires on an axle should be the same brand, model, size and tread pattern.
• Front pair and rear pair: possible on many two-wheel-drive vehicles if the size, type, load index and speed rating match, but handling is most predictable with four matching tires.
• Winter tires: always four matching tires. Ontario's official driver's handbook recommends four winter or all-weather tires with the same tread pattern.
• Never mix winter tires with all-season tires on the same vehicle.

Get the Right Advice for Your Vehicle

Bring your vehicle to our Aurora shop and we'll check tread depth on all four tires, your drive type and your tire sizes, and give you straight advice on two versus four. Shop tires or contact us for a quote. Not sure if your current tires are worn out? See How Long Do Tires Last in Canada?.

Sources

• Government of Ontario, Official MTO Driver's Handbook, "Maintaining your vehicle" (ontario.ca/document/official-mto-drivers-handbook/maintaining-your-vehicle). Checked October 26, 2026.