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Tire Maintenance Checklist

  • PRESSURE  –  Underinflation can lead to tire failure. It results in unnecessary tire stress , irregular wear, loss of control and accidents. a tire can lose up to half of its air pressure and not appear to be flat!

  • ROTATION   –   Regularly rotating you tires will help you achieve more uniform tire wear. Unless your vehicle owner’s manual has a specific recommendation, the guideline for tire rotation is approximately every 3,000 to 5,000 miles.

  • TREAD   –   Advanced and unusual wear can reduce the ability to grip the road in adverse conditions. Visually check your tires for uneven wear, looking for high and low areas or unusually smooth areas. Also check for signs of damage.

  • ALIGNMENT  –   A bad jolt from hitting a curb or pothole can throw your front end out of alignment and damage your tires.Have the trained technicians at A&E Auto Repair check your alignment periodically to ensure that your tires are properly aligned.

Decoding Tire Sidewall Markings

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 205 identifies the tire section width, which is the measurement of the tire from sidewall to sidewall in millimeters. This measurement varies depending on the rim to which it is  fitted.

55 is the two-figure aspect ratio, also known as the profile. This percentage compares the tire’s section height with the  tire’s section width. For example, this aspect ratio of 55 means that the tire’s section height  is 55% of the tire’s section width.

R indicates the construction used within the tires casing. R stands for radial construction. B means  belted bias and D stands for diagonal bias construction.

16 The last dimension listed in the size is the diameter of the wheel rim, which is most often measured in inches.

91  The load index and speed rating, or service description, are the numbers that follow the tire size. The load index tells you how much weight the tire can support when properly inflated. Load indices range from 75 – 105 for passenger tires, with each numeric value corresponding to a certain carrying capacity. The carrying capacity for each value can be found on a load index chart. On each U.S. passenger car tire, the load limit is listed in pounds. European tires have the load limit listed in kilograms and sometimes pounds

W Speed ratings are represented by letters ranging from A to Z. Each letter coincides to the maximum speed a tire can sustain under its recommended load capacity. For instance, S is equivalent to a maximum speed of 112 mph. Even though a tire can perform at this speed, Continental Tire does not advocate exceeding legal speed limits.

Rating Maximum Speed
Q 100 MPH
S 112 MPH
T 118 MPH
U 124 MPH
H 130 MPH
V 149 MPH
W 168 MPH
Y 186 MPH
Z Over 149 MPH

DOT Serial Number

The “DOT” symbol certifies the tire manufacturer’s compliance with the U.S. Department of Transportation tire safety standards. Tires made in the United States have the DOT serial number located on the inside sidewall near the rim.

Below is a description of the serial number. Starting with the year 2000, four numbers are used for the Date of Manufactuer, first two numbers identify the week and the last two numbers identify the year of manufacture.