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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

Used 255/50R19 Bridgestone DUELER H/L 400 MOExtended 107H - 5/32

$56.93
End Date: Tuesday Oct-17-2017 14:01:25 PDT
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255/40R18 Bridgestone Potenza RE760 Sport Tire 95 W (1)

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4 New 245 70 17 Lemans by Bridgestone SUV AS Tires P245/70R17 - 110T 2457017

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LT265/75R16 / 10 Ply Bridgestone Dueler A/T REVO 2 Tire 120 R (1)

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2 New 285 45 22 Bridgestone Dueler H/L Alenza Tires P285/45R22 110H 2854522

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End Date: Sunday Oct-15-2017 11:38:31 PDT
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Used 285/60R18 Bridgestone Dueler HT 684 II 114V - 6/32

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End Date: Tuesday Oct-17-2017 12:39:24 PDT
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2 New 255 70 17 Bridgestone Dueler H/T 684 II Tires P255/70R17 110S 2557017

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SPECIAL - BRIDGESTONE V-Steel Rib R265 LT245/75R16 120/116S 10 Ply (Set of 4)

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Used P 275/55R20 Bridgestone Dueler HL Alenza 111S - 10/32

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4 NEW BRIDGESTONE DUELER D840 - 265/65R17 TIRES 65R 17 2656517

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Firestone Tires

Firestone Tires For Sale

205/70R15 Firestone Winterforce 2 Tires 96 S Set of 2

$135.98
End Date: Saturday Oct-21-2017 13:53:47 PDT
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Firestone Firehawk 245-50-16 Tire Tires (2) 0810-19

$30.00
End Date: Sunday Oct-22-2017 19:22:05 PDT
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235/55R17 Firestone Winterforce 99 S Snow/Winter Tire (1)

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4 New 225/65R17 Firestone All Season Tires 225 65 17 2256517 65R R17

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End Date: Tuesday Sep-26-2017 9:18:21 PDT
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NEW FIRESTONE AFFINITY TOURING - 195/55R16 TIRES 55R 16 1955516

$55.92
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P255/55R20 Firestone All Season Tires 107 H Set of 4

$527.96
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Used 255/70R18 Firestone Destination AT 112S - 9/32

$69.79
End Date: Tuesday Oct-17-2017 15:43:44 PDT
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Coker Tire 72225 Firestone Deluxe Champion Motorcycle Tire 500-16

$157.00
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Used P 215/55R16 Firestone Affinity Touring 93H - 8/32

$51.73
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Used 245/70R17 Firestone Destination LE2 108T - 9.5/32

$68.18
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