What Is a Speed Rating?
The speed rating is a letter code on your tyre sidewall that indicates the maximum speed the tyre can sustain safely under its rated load. Common ratings include T (118 mph), H (130 mph), V (149 mph), and W (168 mph). Your vehicle manufacturer specifies the minimum rating required.
Using tyres with a lower speed rating than specified can invalidate your insurance and compromise safety at high speeds. Higher-rated tyres generally offer better heat dissipation and handling precision.
Understanding Load Index
The load index is a numerical code representing the maximum weight each tyre can support when properly inflated. For example, a load index of 91 equates to 615 kg per tyre. Multiply this by four to find your vehicle's total tyre-supported weight capacity.
Why These Ratings Matter
Speed ratings and load indexes are calculated together — a tyre tested at its maximum speed must also carry its maximum load. Choosing incorrectly rated tyres risks failure, poor handling, and insurance complications.
Always match or exceed your vehicle manufacturer's specifications. If you are unsure which ratings your car needs, a mobile tyre specialist can check your current tyres and recommend appropriate replacements.
