To ensure maximum safety and performance, it is essential to avoid mixing tires on any vehicle. It is recommended that all tires on your vehicle be kept identical in size, make, model, rating, etc. Tire changes must be carried out in complete sets of four, except on high-performance vehicles such as Porsche, where the front and rear wheels may differ.

The reason behind this recommendation is that different tires have different road grip and handling characteristics. If mixed tires are used, they will react inconsistently to the same conditions, which can result in unsafe driving and loss of traction.

In some cases, drivers may not be able to change all four tires simultaneously. For two-wheel drive vehicles, you can change two tires at a time, but it is crucial to match the tires on each axle (two new tires in the rear and two used tires in the front). New tires should be as similar as possible to the existing ones. However, for all-wheel drive vehicles, it is essential to change tires in complete sets of four.

You should never mix all-season tires, winter or summer. These tires are specifically designed for different types of traction and driving conditions. Mixing different types of tires on a vehicle can cause a loss of handling and significantly increase the risk of accidents.

In summary, maintaining consistency in your vehicle's tires and changing them in complete sets of four whenever possible will ensure optimal performance, safe driving, and adequate traction under various road conditions. Don't underestimate the importance of tires, as they are a critical part of your vehicle's safety and performance system.