Can you mix different tires on different axles? We'll clear up any confusion.

Every driver wants their car to be as safe as possible. Choosing the right tires is crucial, but what if you only need to replace one tire? Can you mix different tire models on the same axle? We answer these and other questions in the following article.

Is it permissible to mix different tires on axles? Current road regulations

When we think about combining different tires on a single axle, we're not just thinking about different brands. Nor are we interested solely in the tire model. In practice, the differences that impact driving safety can be much more subtle. Tires can have significantly different tread patterns, and even different degrees of wear. Let's consider what the regulations say about this.

• There is no specific prohibition . In most countries, including Poland, applicable road traffic regulations do not specifically prohibit mounting different tires on the same axle. However, every tire manufacturer recommends that for optimal performance and safety, it is best to use four identical car tires.
• Winter tire regulations . Some countries with winter tire regulations have specific requirements for fitting them. For example, if you choose winter tires, you must have them on all four wheels, regardless of whether you're driving a 4x4 or a standard 2x4.
• Run-Flat Tires . If your car is equipped with run-flat tires, which allow you to drive on flats, you shouldn't combine them with traditional tires. These tires have a special design and are designed to work with specific suspension and steering systems.
• Tires with unequal wear rates . While road traffic regulations don't prohibit mounting tires with unequal wear rates on the same axle, differences in tread depth between tires can affect your vehicle's handling, especially on wet roads. This can reduce driving safety and increase the risk of skidding, collisions, or even accidents.

In summary, while road traffic regulations don't specifically prohibit the use of different tires on the same axle, manufacturers' recommendations are clear. For optimal performance and safety, each axle of a vehicle should be equipped with identical tires. Many car manufacturers even recommend using four identical tires. When in doubt, it's always best to consult a professional tire shop or the car manufacturer.

What are the effects of combining different tires on axles?

If you choose different tire models on the same axle, you can expect a number of problems. Here are a few examples:

• Uneven grip . Different car tire models typically have slightly different grip levels, which can lead to problems, especially when braking or turning.
• Uneven wear . Different tires can wear at different rates, which can lead to premature replacement of one tire.
• Balancing Issues . If you're mounting two different tires on the same axle, they'll usually require separate balancing. Keep in mind that balancing your tires can help reduce vibration while driving, but it won't solve other issues related to the unique design of each tire.
• Drivetrain problems . On 4x4 vehicles, mixing different tires can lead to drivetrain problems.

To avoid problems with mismatched tires on your vehicle's axle, it's best to opt for rim and tire sets right away. Of course, once you have the rims, all you need to do is buy matching tires. You can check which tires you need in your vehicle's manual or by asking your mechanic.

When is it necessary to combine different tires on axles?

While it is recommended to avoid combining different tires on the same axle, there are situations when it may be necessary:

• Accidents . If a single tire is damaged in an accident, it's sometimes necessary to replace it with a different tire, especially if the exact tire model isn't available. However, this approach has its limitations, especially in new vehicles where TPMS sensors are standard equipment to continuously monitor tire pressure.
• Flat tire while driving . If a tire is damaged while driving, you can remove it along with the rim and replace it with a spare tire. It's worth remembering that a spare tire isn't designed for continuous driving. It's only intended to get you to a repair shop where the damaged tire can be repaired.

Tyre connection and driving safety

Safety is one of the most important aspects every driver should remember. Choosing the right tires is crucial to a car's road performance. But how does combining different tires affect driving safety?

• Grip . Different tire models can have different grip characteristics, especially in challenging weather conditions. Combining tires with different tread patterns or varying degrees of wear can lead to uneven vehicle handling, especially when braking and cornering.
• Reaction to aquaplaning . Different tire designs can react differently to aquaplaning. If one tire has better water evacuation than another, it can lead to loss of vehicle control on wet roads.
• Cornering performance . If the tires on the same axle have different handling characteristics, this can affect the vehicle's handling in corners. The vehicle can become less predictable, increasing the risk of an accident.
• Braking . Different tire models can have different braking properties. If the tires on one axle don't brake evenly, this can cause the vehicle to swerve when braking, which is especially dangerous in emergency situations.
• Wear and durability . Mixing different tires can lead to uneven wear, which in turn can shorten tire life and increase replacement costs.
• Driving comfort . Different tires can offer different driving comfort. Combining tires with different driving characteristics can lead to vibration, noise, or other unpleasant driving sensations. Therefore, it's always a good idea to fit identical tires to the drive axles.

In summary, while regulations don't prohibit combining different tires on the same axle, it's recommended to avoid this practice for safety reasons. If you decide to do this, it's important to regularly inspect your tires and your vehicle's handling. Professional tire balancing is also essential. Furthermore, if you have any doubts, you can always consult a mechanic.