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Understanding Tire Sidewall Codes!

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What does all the numbers mean? Each section of small print on a tire's sidewall means something! Car, Truck and SUV tire ratings are described by an alphanumeric code which is generally molded into the side-wall of the tire. This code specifies the dimensions of the tire and some of its key limitations such as load bearing ability and maximum speed. There are two important parts to your tire size. The size itself and the service description.
Tire Size and Service Description
alphanumeric tire code
Car tires and Truck tires are made up of three numbers. The first number is the tire width and is displayed in millimeters. The second number is the aspect ratio, which is the sidewall height listed as a percentage of the width. Followed by an R for Radial. The last number is the rim size or diameter in inches. When determining what tire you need all three of these numbers width, aspect ratio and rim size should match exactly.

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The tire Service Description is made up of two parts. The first is a two or three digit number indicating the load rating or index of the tire. This determines the weight the tire can carry. When replacing tires, you should select a tire with the same or higher load index than what is listed on the tire information placard.

Following the load index number is a letter called the speed ratings. This letter determines the top speed this tire can handle. Higher speed ratings usually mean better handling. You should select a speed rating that indicates the same top speed or higher than what is listed on your tire information placard.

Vehicle Placard

Vehicle Placard

The P designates that the tire is a passenger vehicle tire. Some other designations are LT for light truck, and T for temporary, or spare tires. The R designates that the tire was made using radial construction. Tire traction is rated AA, A, B or C, with AA at the top of the scale. The tire temperature ratings are A, B or C. The rating is a measure of how well the tire dissipates heat and how well it handles the build up of heat. The load rating is a number that correlates to the maximum rated load for that tire. A higher number indicates that the tire has a higher load capacity. The letter that follows the load rating indicates the maximum speed allowable for this tire. An S indicates that the tire can handle speeds up to 112 mph. M&S for Mud and Snow. TL means tubeless.

Some tread designs are designed to perform better when driven in a specific direction (clockwise or counter-clockwise). Such tires will have an arrow showing which way the tire should rotate when the vehicle is moving forwards. It is important not to put a 'clockwise' tire on the left hand side of the car or a 'counter-clockwise' tire on the right side.

Bridgestone Tires

Bridgestone Tires For Sale

2 New 235/75R15 XL Lemans by Bridgestone SUV AS Tires 75 15 2357515 75R R15

$154.00
End Date: Friday Jun-1-2018 14:16:07 PDT
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255/70/17 BRIDGESTONE DUELER D684 HT NEW TAKE-OFF TIRES SET 99.9% TREAD

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225/50-17 Bridgestone Blizzak LM-32 50R R17 Single Winter tire - 19418

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Set of 4 Bridgestone Turanza ER300 P195/65R15 195 65 15 Tire - Missing Sticker

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4 New 165 65 14 Bridgestone Potenza RE92 Tires

$299.00
End Date: Wednesday May-30-2018 10:11:03 PDT
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4 NEW 245/40-17 BRIDGESTONE POTENZA RE71R 40R R17 TIRES 29680

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2 X Bridgestone POTENZA RE760 SPORT 255/40R18 95W Impressive Performance Tires

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Set of 4 Bridgestone Blizzak WS70 215 55 R17 Used

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Bridgestone Blizzak DM-V1 265/50R19XL 110R BSW (4 Tires )

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4 BRIDGESTONE ECOPIA EP422 PLUS 205/65/15 205 65 15 205/65R15 TIRES (AM724)

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Firestone Tires

Firestone Tires For Sale

FIRESTONE Steel Belted Radial F560 125R15 (Quantity of 1)

$71.00
End Date: Friday Jun-15-2018 16:53:17 PDT
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1 New Firestone Firehawk Indy 500 - 245/45r20 Tires 45r 20 245 45 20

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4 New Firestone All Season - 215/70r16 Tires 70r 16 2157016

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Used 235/60R16 Firestone Affinity Touring 99T - 8/32

$53.90
End Date: Monday Jun-18-2018 9:55:30 PDT
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Coker Firestone Military Tire 7.00-15 Bias-ply Blackwall 587117 Each

$127.00
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Firestone Firehawk GT 185/55/15 82H

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End Date: Saturday Jun-23-2018 18:25:44 PDT
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Coker Firestone Motorcycle Tire 5.00-16 Bias-ply Blackwall 73225 Each

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Coker 56047 Firestone F560 Blackwall Radial Tire-155R15, 4-5.5 In. Rim

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Firestone Vintage Bias Tire, 560-15 2.75 Inch Whitewall

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End Date: Wednesday Jun-20-2018 23:49:29 PDT
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4 New 225/65R17 Firestone All Season Tires 225 65 17 2256517 65R R17

$368.00
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