Ever noticed the letter ‘R’ on your tyre’s sidewall and wondered what it stands for? This guide breaks down the meaning behind the ‘R’ marking, explains what radial tyres are, and highlights why most modern vehicles rely on them for strength, safety, and smooth performance.
When you next go to check your tyres, you might notice that the sidewall is littered with markings and symbols, all of which denote different pieces of information and different details.
Amongst the various numbers and symbols is the tyre size calculation – a set of numbers and letters that are used by tyre suppliers and mechanics to identify which tyres you need for your vehicle.
This calculation communicates details like the tyre size and diameter, load rating, speed rating, and more. The ‘R’ symbol is one part of this calculation and is responsible for letting you know the tyre construction.
Deciphering the ‘R’ Symbol in Your Tyre Size Calculation
If you can see the letter ‘R’ nestled into your tyre size calculation, then this means that your tyre construction is what’s known as ‘Radial’.
Most modern tyres are radial. It means that the internal structure of the tyre is made up of cords which run across the middle of the tyre, from one sidewall bead to the other. The perpendicular structure of these cords ensure excellent flexibility and strength, optimising handling as well as performance.
A major benefit of radial tyres is that they absorb shocks and impacts effectively, making them better suited tyres to everyday driving. There is also a higher resistance to tread wear, and enhanced safety as a result.
