In the sequence 225 / 50 R 17, what does the number 50 indicate?

In the sequence 225 / 50 R 17, the number 50 represents the aspect ratio of the tire. Aspect ratio is a measurement of the tire's sidewall height in relation to its width. It is calculated by taking the height of the sidewall as a percentage of the tire's width.

In this case, a 50 aspect ratio means that the height of the tire's sidewall is 50% of its width, which is 225 mm. This specification helps determine the overall profile and handling characteristics of the tire. A lower aspect ratio typically indicates a shorter sidewall, which can enhance performance by providing better cornering stability, while a higher aspect ratio might offer more comfort or better cushioning.

Understanding the aspect ratio is essential for selecting tires that offer the desired balance between performance and comfort based on vehicle type and driving conditions.