What do you mean you can not install that tire on my car? This is an all to familiar question we hear everyday as tire salesmen.
Each tire has a load and speed index rating that must be followed. If a vehicle requires a 91W rated tire one cannot simply install a tire designated for a much lower speed rateing. Take, for example, a 2004 Mazda RX-8, The RX-8 is a sports car that requires at least a 91W rated tire. We could install a tire that has a higher load and speed rating with no issue.
Tire Speed rating on Side wall of the tire.
The problem arises when a customer attempts to install a tire with lower ratings, for example, attempting to install a tire with only a 94H rating on the same Mazda RX-8 WILL call issues. The 91W tire is rated to handle up to 168 mph under perfect conditions. The 94H tire is only rated to handle speeds of up to 130 mph. If a tire rated below 91W is installed on the RX-8 it could rupture at high speeds. Causing bodily harm and even death.
Another issue you may run into if a lower speed rated tire is installed is legality retribution and heavy fines. If you as a consumer, tire dealer, and or salesman installs an inappropriate rated tire and the vehicle was involved in an accident the car's insurance company can refuse to pay up. The insurance company would then pursue the tire dealer and or salesman for compensation. It may take years for the consumer's vehicle to get repaired and or replaced.
When purchasing tires please be aware of speed ratings on tires. You must ensure that the tire can handle the performance of the vehicle it is being installed on. Here at Porter's Tire Store, your safety is our top priority! We will gladly double check for you if you are unsure about the speed rating on your vehicle. All you have to do is please email us and or use the live chat function at the bottom of the page and someone will be with you shortly.