Breaking Down the Tire Code
Let's decode a standard tire specification such as 245/40R18:
- 245 (Section Width): The width of the tire tread in millimeters (245 mm).
- 40 (Aspect Ratio): The height of the sidewall expressed as a percentage of the width. Here, the sidewall height is 40% of 245 mm (98 mm).
- R (Radial Construction): Indicates the ply cords run radially across the tire casing.
- 18 (Wheel Diameter): The diameter of the wheel rim in inches.
Vehicle Safety Best Practices:
- • Clearance Checks: Larger widths might rub against suspension struts or fender linings when turning full lock.
- • Load Index: Ensure replacement tires equal or exceed the manufacturer's load carrying index.
- • Speed Rating: Always use tires that meet the maximum potential speed capability of the vehicle.