How to Read a Tire Size The sidewall of a tire makes good reading - if you know how to interpret the information you'll find there.  Take a look at these basic definitions. 1. 205  Width of the tire in millimeters. 2. 55  Aspect ratio - This sidewall's height is roughly 55% of the tire's width. 3. R  For radial construction 4. 16  Nominal rim diameter code of the wheel on which the tire fits. 5.  88  Load index is a numerical code associated with the maximum load a tire can carry under certain service conditions. 6. V  Speed symbol - This tire can carry a specified load under specified service conditions at speeds up to 149 mph. 7. 88V  Service description, a combination of the Load Index and Speed Symbol. Service Description The service description contains a two-digit number (load index) and a letter (speed rating). In this example (left) the service description has a load index of 82 and a speed rating of H. Note: Some size designations may be preceded by a "P", signifying Passenger or "LT", signifying Light Truck.

 
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