What do the four digits found on a motorcycle tire indicate?

Answer: B — The expiration date of the tire

The four digits found on a motorcycle tire are part of the Tire Identification Number (TIN) and specifically indicate the week and year the tire was manufactured. The first two digits represent the week of production, while the last two digits indicate the year. For instance, if the numbers are "2319," this signifies that the tire was manufactured in the 23rd week of 2019. This information is critical for riders to determine the age of the tire and to ensure safety, as older tires may not perform optimally or could be more susceptible to failure. Understanding the manufacturing date helps in assessing whether it's time to replace the tire based on age, regardless of tread wear.