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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

4 New Bridgestone Dueler H/t - P255/70r18 Tires 70r 18 2557018

$416.52
End Date: Wednesday Nov-14-2018 10:57:20 PST
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4 New Bridgestone Dueler H/t 684 Ii - 255/70r18 Tires 70r 18 255 70 18

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Bridgestone Ecopia EP422 - 205/55R16 - 89H - Tire

$19.99 (0 Bids)
End Date: Saturday Oct-20-2018 6:42:59 PDT
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295/30R19 100Y BRIDGESTONE POTENZA

$269.00 (0 Bids)
End Date: Monday Oct-22-2018 2:34:01 PDT
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NEW Bridgestone Potenza RE750 205/40-17 Treadwear 340 Traction AA Set of 4 Tires

$350.00
End Date: Wednesday Nov-7-2018 12:53:47 PST
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4 New 225/60R16 Lemans by Bridgestone Touring AS II Tires 60 16 2256016 R16 USA

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End Date: Monday Oct-22-2018 13:15:39 PDT
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Bridgestone Blizzak DM-V2 265/70R17 115R BSW (4 Tires)

$727.57
End Date: Wednesday Oct-17-2018 11:32:49 PDT
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2 NEW 245/75R16 Hankook Dynapro HT RH12 Tires 245 75 16 2457516 R16 Factory Tire

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End Date: Thursday Nov-1-2018 6:43:29 PDT
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215/55R-16 BRIDGESTONE BLIZZAK WS80 XL on 16X6.5 5-112 ET42 ST Steel Wheels

$137.50 (7 Bids)
End Date: Saturday Oct-20-2018 15:39:30 PDT
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4-NEW-255-70R18-Bridgestone-684II-Tires-255-70-18-2557018-R18-Factory-Take-Offs

$380.00
End Date: Tuesday Oct-30-2018 20:52:23 PDT
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Firestone Tires

Firestone Tires For Sale

2 265 55 17 105H Firestone Firehawk GTA 02 Tires 9-9.5/32 1d30 3507

$233.10
End Date: Friday Nov-2-2018 12:33:14 PDT
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4 New Firestone All Season - 205/70r15 Tires 70r 15 2057015

$239.80
End Date: Wednesday Nov-14-2018 11:33:38 PST
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Firestone Firehawk Indy 500 225/40R18XL 92W BSW (2 Tires)

$217.71
End Date: Saturday Nov-10-2018 19:42:02 PST
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Firestone Winterforce 205/70R15 96S BSW (2 Tires)

$150.85
End Date: Tuesday Nov-6-2018 5:20:49 PST
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Firestone All Season 205/70R15 96T BSW (4 Tires)

$259.57
End Date: Wednesday Oct-31-2018 10:47:17 PDT
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Firestone Transforce AT2 LT235/80R17 E/10PR BSW (1 Tires)

$175.57
End Date: Monday Oct-15-2018 14:19:09 PDT
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Firestone Firehawk Indy 500 245/45R20XL 103W BSW (1 Tires)

$145.41
End Date: Saturday Oct-20-2018 8:17:26 PDT
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Firestone Firehawk Indy 500 225/40R18XL 92W BSW (1 Tires)

$109.95
End Date: Saturday Nov-10-2018 19:42:00 PST
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235/60R16 Firestone All Season 100T BSW Tire(s) 2356016 235/60-16

$70.99
End Date: Friday Nov-9-2018 11:14:15 PST
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Firestone grooved tires - 7.50 x 14.00 - 16 W

$422.00
End Date: Friday Oct-19-2018 7:34:02 PDT
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