Tyre grading can seem confusing, but understanding A, B and C ratings is key to choosing tyres that match your driving needs. This guide breaks down what each grade means, how temperature resistance affects safety, and which grades are most suitable for UK roads. Get clear, practical advice to help you pick the right tyres with confidence.
Anyone who has had to read and interpret the size of their vehicle’s tyres, the date of manufacturing, or the speed and load rating will know just how many markings there are on any single tyre.
One of the markings that you may be less familiar with, however, is the ABC rating – with many tyres boasting one of these letters to help guide vehicle owners in choosing the right tyres for their vehicle and driving behaviour.
But what does the ABC grading mean and is it something you should consider when buying new tyres?
What Does the Grading Refer To?
The ABC rating on a tyre indicates its temperature rating – that is, the tyres ability to withstand heat buildup and to dissipate this heat across the entire surface of the tyre to minimise wear and tear.
A is the highest grade, with C the lowest grade. Keep reading for a more thorough breakdown of what each letter tells you about the tyre.
Before we get that far however, it’s important to note that testing of temperature rating is incredibly complex, with tyre manufacturers struggling to find a standardised procedure for measuring and grading their tyres. A great deal of the temperature buildup comes from the way the vehicle is driven, speed, road surface, and driving behaviour.
This means that the grading can only accurately be used as an indicator of how efficient a single tyre is at dissipating heat.
Deciphering Each Grade
With an ABC structure of grading, here’s what each letter means in real time…
A grade A means that the tyre boasts the highest level of resistance to heat on the road. Its structure can withstand high temperatures and the pressure that comes with those temperatures, making this the only rating that’s suitable for performance cars and vehicles used in motorsport.
A grade B is considered the middle man of tyre grading. A tyre with this grade can withstand relatively high temperatures for a set period of time, before potential damage occurs. This is the grade most often given to large people carrier vehicles and light trucks which carry a significant weight.
A grade C is the lowest grade and, while considered acceptable for regular cars and everyday runaround vehicles, these tyres should not be used for driving in adverse or extreme conditions. They are especially unsuitable for driving in high temperature locations, or for motorsport racing.
Why Does Tyre Grading Matter?
The grade of the tyres on your vehicle (or indeed any vehicle) matter because they indicate an integral safety feature. This grade tells you the ideal maximum temperature that the tyre is designed to withstand, with older tyres becoming more susceptible to damage with continued use.
Suffice to say, regardless of whether you drive in regular conditions or as part of performance driving and racing, tyre grading lets you know how suitable a tyre is to fast driving and extreme conditions.
