Using a mixture of different-sized tires can be:

Using a mixture of different-sized tires on the same axle can indeed be dangerous due to the potential for handling and stability issues. When tires of different sizes are installed on the same axle, they can create uneven traction and lead to unpredictable vehicle behavior during braking and cornering. This is particularly critical for vehicles that rely on all wheels to function in harmony for safety and performance. For example, different-sized tires can affect the speedometer readings, cause unnecessary wear, and may negatively affect the vehicle's suspension system.

In contrast, using different-sized tires on different axles can sometimes be acceptable, depending on the vehicle type and manufacturer specifications. However, mixing tire sizes within the same axle should always be avoided to maintain safety and control over the vehicle.