Is it permissible to use mismatched tire sizes on the same vehicle?

Using mismatched tire sizes on the same vehicle is not permissible for several critical reasons related to safety and vehicle performance. Tires play a crucial role in how a vehicle handles, its braking effectiveness, and overall stability. When tires mismatch in size, it can lead to uneven wear, compromised traction, and difficulties in steering, which pose safety risks, especially when driving under specific conditions or in emergency situations.

Maintaining uniform tire sizes optimizes the vehicle's performance and enhances its handling capabilities. Uniformity ensures that all tires grip the road effectively, prevent issues like hydroplaning, and provide predictable steering responses. Therefore, it is essential to have all tires match in size to ensure safety and the proper functioning of the vehicle's alignment, brakes, and suspension systems. This is why having mismatched tire sizes is not allowed, and adherence to this guideline is particularly important in commercial driving scenarios, where the stakes are often higher.