The most prominent information on the sidewall relates to the tyre's size. This information is crucial when it comes to replacing your tyres. The size is typically expressed in numbers and letters, such as 205/55R16. Here's what each part of the code means:

(1) 225: This is the tyre's width in millimetres measured from sidewall to sidewall.

(2) 60: This represents the aspect ratio, which is the thickness of the sidewall as a percentage of the tyre's width. In this example, the sidewall height is 55% of the tyre's width.

(3) R: This letter stands for the construction of tyre. Typically this will be an R for radial, although other letters do exist.

(4) 16: Indicates the diameter of the wheel in inches that the tyre is designed to fit.

(5) 98: The last set of numbers represents the load rating, which is the maximum weight the tyre can carry in kg, assuming the tyre is correctly inflated.

(6) Q: Indicates the speed rating, representing the maximum speed the tyre is designed to handle safely. Speed ratings range from Q (99 mph) to Y (186 mph). It's crucial to match the speed rating with your vehicle's capabilities. Understanding this code is essential when selecting new tyres to ensure they are compatible with your vehicle.