23/11/2025
Understanding the Numbers!
Ever look at your tire and wonder what all those numbers mean? They're actually a crucial code that tells you the size and type of the tire!
Let's break down the common code, using 235/50R18 as our example:
1. 235 (Section Width)
This number, 235, is the width of the tire in millimeters from one sidewall to the other.
Wider tires (a larger number) generally offer more grip but can reduce fuel economy.
2. 50 (Aspect Ratio / Sidewall Height)
This number, 50, is the aspect ratio—it tells you the height of the tire's sidewall as a percentage of the width.
In this case, the sidewall height is 50% of the 235 mm width.
Lower numbers (like 40 or 35) mean a shorter, "lower profile" sidewall, which often improves handling but gives a rougher ride.
3. R (Construction Type)
The R stands for Radial construction, which is the standard type for almost all passenger vehicles today. (Other, less common types exist, but 'R' is most typical).
4. 18 (Rim Diameter)
This final number, 18, is the diameter of the wheel (or rim) that the tire is designed to fit, measured in inches.
Larger numbers mean bigger wheels!
97 (Load Index)
The number 97 is the Load Index. This is a code that corresponds to the maximum weight capacity (in kilograms or pounds) that a single tire can safely carry when properly inflated
