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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

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

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End Date: Thursday Aug-9-2018 11:49:07 PDT
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Bridgestone V-Steel Rib 265 LT245/75R16 E/10PR BSW (1 Tires)

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Bridgestone Potenza S-04 Pole Position 205/55R16 91Y BSW

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Bridgestone P285/45r22 110H Alenza (13/32ths)

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End Date: Wednesday Aug-1-2018 5:05:44 PDT
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4 New 265/65R18 Inch Bridgestone Dueler H/L 683 Tires 265 65 18 R18 2656518

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New Bridgestone R283a Ecopia - 275/80 R22.5 Low Pro Steer Tire

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1 NEW 235 55 18 Bridgestone Turanza EL400-02 RFT 235/55R18 99TTire

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4 225 50 17 94H Bridgestone Blizzak WS80 Snow Tires 9-10/32 No Repairs 2615

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Bridgestone Dueler A/T REVO 2 P265/75R16 114T WL (1 Tires)

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Firestone Tires

Firestone Tires For Sale

1 New Firestone Transforce Ht - 235x85r16 Tires 85r 16 2358516

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End Date: Tuesday Jul-17-2018 8:39:26 PDT
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4 New Firestone All Season - 225/60r17 Tires 60r 17 2256017

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Firestone All Season 215/65R16 98T BSW (4 Tires)

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End Date: Thursday Aug-2-2018 10:47:16 PDT
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SPECIAL - FIRESTONE Firehawk Wide Oval Indy 500 245/40R20 XL 99W (Quantity of 1)

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End Date: Sunday Jul-29-2018 17:33:28 PDT
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4 New 225/65R17 Firestone All Season Tires 225 65 17 2256517 65R R17

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FIRESTONE Steel Belted Radial F560 135R15 (Quantity of 2)

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225/60R18 Firestone Firehawk AS Tires 100 V Set of 4

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Firestone All Season 205/70R15 96T BSW (4 Tires)

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1 New Firestone Destination Le2 - 265/70r17 Tires 70r 17 2657017

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FIRESTONE Steel Belted Radial F560 165R15 (Quantity of 1)

$85.00
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