The numbers on a tires sidewall provide information about the tires type, width, aspect ratio, construction type, diameter, load index, and speed rating. Here is a breakdown of what each number means:

• Tire type: The first letter in the code tells you what class of tire it is. For example, "P" stands for passenger vehicle tire.
• Tire width: The three-digit number following the tire type letter is the width of the tire in millimeters measured from sidewall to sidewall.
• Aspect ratio: The forward slash separates the tire width number from the two-digit aspect ratio. The aspect ratio is the height of the tires sidewall as a percentage of its width.
• Construction type: The tire letter meaning refers to the construction of the tire. For example, "R" stands for radial construction.
• Wheel diameter: This two-digit number specifies wheel diameter in inches.
• Load index: Load index is a two or three-digit number that tells you how much weight the tire can safely support.
• Speed rating: Speed rating is the last letter in the tire code and indicates the top speed a tire is designed to ride.

Its important to note that tire numbers can change depending on the tires type and size. If youre unsure about what the numbers on your tire mean, its best to consult a tire professional for help.