What Do the Numbers on My Tires Mean? | Virginia Tire & Auto

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What Do the Numbers on My Tires Mean? How to Read Tire Sizes

Being able to promptly glance at the sidewall of your run down and determine the tire size your specific vehicle needs can save you meter, fuss and money. evening still, not many people know how to actually read a tire size even though it ’ south printed right there on the sidewall. As a mix of letters and numbers, it ’ randomness not as easy to read as finding a size 9 brake shoe.

Why Tire Size Matters 

early than the fact that tires need to physically fit on your vehicle, there are several reasons why having the chastise bore size is necessity. Your tires support the integral weight of your vehicle and are the merely parts of your cable car that actually make contact with the road. Making surely that you select the proper tire size when it ’ second clock time to shop for new tires is critical to the health of your tires and vehicle. A bore ’ randomness occupation is to carry your vehicle and guide it where it needs to go, so when a tire is excessively bombastic or excessively small, not only is performance hindered but your guard is besides put at risk. Your tires need to be broad, firm and thick adequate to carry the weight of your vehicle while hush being able to turn and move. Scratching along the sides or getting caught while trying to turn could cause serious damage to your tires, forcing you to replace them much sooner than you ’ d otherwise motivation.

What Do the Numbers on My Tires Mean?

Looking at bore size for the first time can feel like reading a extraneous lyric, but once you learn how to break down what each section of the tire size means, you ’ ll find they ’ re not all that complicated.

Tire Type 

Tire type refers to the service or type of fomite that the bore was designed for. “ P ” stands for “ passenger ” and is the most park type of tire. “ LT ” ( light trucks that carry heavy loads ) is another common run down character designation that you ’ ll probable run into. other tire types include “ T ” ( irregular ), “ ST ” ( trailer ) and “ C ” ( commercial ). If there is no letter, that normally indicates that the tire was manufactured in Europe for european cars. These types of tires are called system of measurement or Euro-metric tires and are similar in many ways to a passenger tire.

Tire Width 

Measured in millimeters, this is the distance from sidewall to sidewall across the width of your tire.

Aspect Ratio/Profile 

Aspect ratio refers to the kinship between the tire ’ s sidewall stature and the run down ’ second width in the phase of a share. Sidewall stature can be determined by measuring the distance between the border of the rim and the peak of the tire at the edge of the step. Aspect proportion translates to how well your vehicle can handle the run down. The higher the aspect ratio, the longer it takes for your bore to respond to a turn command, making lower aspect tires frequently easier to command.

Construction Type 

This refers to how the run down was constructed. typically, you ’ ll only see “ R ” for “ radial tire ” since that is the most park type of tire produced present. radial tires are constructed by assembling piles perpendicular to the steering that they travel, allowing for a smooth ride, longer tread life and reduce fuel production.

Wheel Size/Rim Diameter 

Measured across the center of the run down from one end to the other, steering wheel size refers to the diameter of your wheel and is typically measured in inches. overall wheel size is frequently indicated by the rim diameter as a shorthand for what size run down your fomite needs.

Load Index 

Load index is a shorthand way of describing the total weight that the run down can handle when it is fully inflated. The higher the load index rat, the more weight the tire can carry. You need a tire load index rat graph to see how your load index denounce correlates to the weight the run down can carry. For exemplar, a load index of 81 means that the bore can carry up to 1,019 pounds. Load index ratings for the average vehicle scope from 75-100, but some tires can range all the way up to 150, which equates to 7,385 pounds.

Speed Rating 

Like load index, travel rapidly rating is another shorthand direction to reference how fast the bore is designed to go. It is indicated by a letter that corresponds to the utmost accelerate of the tire. For example, a speed evaluation of “ T ” means that the tire is designed to go improving to 118 miles per hour. Read : A Guide to Tire Load Index & Speed Ratings

How to Read Tire Sizes

Breaking down a tire size measurement into its individual parts makes it easy to read once you ’ re in the know. now that you know what each element of tire size means, we can walk through an model of how to read a tire size off of a sidewall.

Example: P255/45R18 103H

P (Tire Type): This tire is a passenger run down, one of the most common types of tires. 255 (Tire Width): The tire width is 255 millimeters from sidewall to sidewall ( merely over ten inches ). 45 (Aspect Ratio): The bore ’ sulfur sidewall is 45 % of the tire ’ s width, which means the sidewall is about 114 millimeters or good over 4 inches. R (Construction Type): Radial tire, the most common type of bore produced nowadays. 18 (Wheel Size/Rim Diameter): Going from edge to edge, the run down ’ sulfur diameter is 18 inches across. 103 (Load Index): A burden index of 103 means this tire can carry up to 1,929 lbs. H (Speed Rating): A rush evaluation of “ H ” means that this run down is designed to withstand speeds up to 130 miles per hour.

Read more : Clark County, NV

In summary, a P255/45R18 103H tire would be a passenger run down with a width of 255 millimeters, a thickness or aspect proportion equal to 45 % of the run down height which here is 114 millimeters. It is besides a radially constructed tire with a diameter of 18 inches that can carry up to 1,929 pounds and can go up to 130 miles per hour.

We’ll Help You Decode All Your Tire Needs

If reading bore sizes distillery seems like a mystery, shed by your local Virginia Tire & Auto and let our tire experts walk you through the process. We ’ ll aid you find the exact tire your vehicle needs. Schedule an date on-line or call 855.425.3677 to talk to a tire expert.

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