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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 BMW i3 Bridgestone Tire (2) 155/70/r19 and (2) 175/60/r19 Ecopia EP600

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End Date: Monday May-21-2018 13:36:52 PDT
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NEW! 275 40 19 Bridgestone Potenza RE970AS Pole Position Tire 101W 275/40R19

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Used P 275/55R20 Bridgestone Dueler H/L Alenza 111S - 7/32

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BRIDGESTONE V-Steel Rib R265 LT245/75R16 120/116S 10 Ply (Quantity of 1)

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Set of (2) Used 205/55R16 Bridgestone Turanza Serenity Plus 91H - 7.5/32

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Bridgestone 000545 Potenza RE050A 225/50-18 Tire (Set of 2)

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1 NEW Bridgestone Blizzak LM-32 255/40R18XL 99V BSW

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2 NEW 225 45 18 Bridgestone Potenza RE760 Sport 225/45R18 91W Tires

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Bridgestone Ecopia EP 422 205/55R16 89H Set of 2 New Tires

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Firestone Tires

Firestone Tires For Sale

Coker Firestone Wide Oval Tire F70-14 Bias-ply Wht Letter 54850 Each

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8.75R16.5LT -Firestone Transforce HT- BLK 115R E 10Ply

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1 New Firestone Firehawk Indy 500 - 275/40r19 Tires 40r 19 275 40 19

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4 New 235 75 15 Nexen N'Priz AH5 White Wall Tires

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Firestone 011986 Firehawk Indy 500 205/50-16 Tire

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1 New Firestone Transforce At - 265x75r16 Tires 75r 16 2657516

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017970 Firestone Destination Le 2 P245/60R18 - 104H - Tire Only

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1 NEW Firestone Transforce HT 235/65R16 E/10PR BSW

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2 New 285/35R19 99W Firestone Firehawk Indy 500 285 35 19 Tires

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1x P265/65R18 Firestone Destination LE2 9/32nds Used Tire

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