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Here are some other markings you may find on your tire's sidewall:

 

• The M+S (also displayed as M&S or M-S) indicates the tire has all season capabilities. You will find this on almost all all season and winter tires. Summer tires will not have this designation. For a tire to get this designation it must have a specified tread-to-void ratio; however it does not mean that the tire has passed any actual tests for it effectiveness in severe conditions.
• DOT stands for Department of Transportation. The 10, 11 or 12 digit code appearing after the DOT designation gives information such as the week and year the tire was produced, as well as the manufacturer, plant, tire line, and size. The first 2 characters designate the tire's manufacturer and plant code. The third, fourth and fifth characters, are the tire size code. The last three or four numbers (4 numbers for years after 2000) are when the tire was manufactured. The first two digits of the date code represent the week and the last 1 or 2 digits represent the year.
• Maximum Inflation Pressure is the highest inflation pressure that the tire can withstand. This is not, however, the recommended inflation pressure. Inflation pressures should never be below the recommended pressure or above the maximum pressure branded on the sidewall.