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 quickly glance at the sidewall of your run down and determine the run down size your specific vehicle needs can save you time, worry and money. flush distillery, not many people know how to actually read a tire size even though it ’ s printed right there on the sidewall. As a mix of letters and numbers, it ’ sulfur not as comfortable to read as finding a size 9 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 correct tire size is necessary. Your tires support the entire weight of your vehicle and are the only parts of your cable car that actually make contact with the road. Making certain that you select the proper tire size when it ’ second time to shop for modern tires is critical to the health of your tires and fomite. A run down ’ sulfur job is to carry your vehicle and guide it where it needs to go, so when a tire is excessively boastfully or excessively small, not only is performance hindered but your guard is besides put at risk. Your tires need to be wide, strong and slurred enough to carry the weight of your vehicle while still being able to turn and move. Scratching along the sides or getting caught while trying to turn could cause serious wrong to your tires, forcing you to replace them much sooner than you ’ vitamin d differently motivation.

What Do the Numbers on My Tires Mean?

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

Tire Type 

Tire character refers to the service or type of vehicle that the tire was designed for. “ P ” stands for “ passenger ” and is the most park type of tire. “ LT ” ( light trucks that carry intemperate loads ) is another common bore type designation that you ’ ll likely run into. other run down types include “ T ” ( temp ), “ ST ” ( preview ) 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 metric unit or Euro-metric tires and are like 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 run down.

Aspect Ratio/Profile 

Aspect ratio refers to the relationship between the tire ’ s sidewall acme and the tire ’ randomness width in the form of a share. Sidewall acme can be determined by measuring the distance between the boundary of the rim and the top of the tire at the edge of the tread. Aspect ratio translates to how well your fomite can handle the tire. The higher the aspect proportion, the longer it takes for your tire to respond to a turn command, making lower aspect tires frequently easier to command.

Construction Type 

This refers to how the bore was constructed. typically, you ’ ll alone see “ R ” for “ radial tire ” since that is the most common type of run down produced nowadays. radial tires are constructed by assembling piles perpendicular to the direction that they travel, allowing for a smooth drive, longer tread biography and reduce fuel production.

Wheel Size/Rim Diameter 

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

Load Index 

Load index is a shorthand way of describing the total weight that the tire can handle when it is in full inflated. The higher the load index fink, the more weight the tire can carry. You need a tire load index evaluation graph to see how your load index rating correlates to the weight the run down can carry. For exemplar, a load exponent of 81 means that the tire can carry up to 1,019 pounds. Load index ratings for the median vehicle crop 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, amphetamine denounce is another shorthand means to reference how fast the bore is designed to go. It is indicated by a letter that corresponds to the maximum focal ratio of the tire. For exemplar, a speed denounce of “ T ” means that the tire is designed to go up to 118 miles per hour. Read : A Guide to Tire Load Index & Speed Ratings

How to Read Tire Sizes

Breaking down a run down size measurement into its individual parts makes it easy to read once you ’ re in the know. now that you know what each chemical element of bore size means, we can walk through an model of how to read a run down 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 run down width is 255 millimeters from sidewall to sidewall ( precisely over ten inches ). 45 (Aspect Ratio): The tire ’ sulfur sidewall is 45 % of the tire ’ second width, which means the sidewall is about 114 millimeters or precisely over 4 inches. R (Construction Type): Radial run down, the most common type of tire produced nowadays. 18 (Wheel Size/Rim Diameter): Going from edge to edge, the bore ’ south diameter is 18 inches across. 103 (Load Index): A cargo index of 103 means this tire can carry up to 1,929 lbs. H (Speed Rating): A travel rapidly rat of “ H ” means that this tire is designed to withstand speeds up to 130 miles per hour.

In compendious, a P255/45R18 103H tire would be a passenger tire with a width of 255 millimeters, a thickness or aspect ratio equal to 45 % of the run down height which here is 114 millimeters. It is besides a radially constructed bore 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 read bore sizes however seems like a mystery, drop by your local Virginia Tire & Auto and let our tire experts walk you through the procedure. We ’ ll avail you find the exact tire your vehicle needs. Schedule an appointment on-line or call 855.425.3677 to talk to a tire expert.

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Category : How To

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