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Your Nearest Store:

4700 N Brandywine Dr
Peoria, IL
309.340.4981

tiresplus storefront
Most stores are open nights and weekends

Store Hours:
Day(s) Hours
MON-FRI: 7:00am-7:00pm
SAT: 7:00am-6:00pm
SUN: 9:00am-5:00pm
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Your Nearest Store:

4700 N Brandywine Dr
Peoria, IL
309.340.4981

tiresplus storefront
Most stores are open nights and weekends

Store Hours:
Day(s) Hours
MON-FRI: 7:00am-7:00pm
SAT: 7:00am-6:00pm
SUN: 9:00am-5:00pm
Schedule An Appointment Learn more about Brake Service

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How to Read Tire Size

The importance of tire size explained.

Why Does Tire Size Matter?

Every vehicle is designed and manufactured to require a specific tire size. Putting the wrong size tire on your car could possibly damage your new tires and your vehicle, costing you more money over time. It can also be dangerous to drive with the wrong size tires. Knowing your correct tire size is an essential part of owning a vehicle and staying safe on the road.

 

Tire stack background. Selective focus.

How Do I Know The Right Tire Size?

There are a few ways to determine the right tire size for your vehicle.

  • Check your owner’s manual
  • Check the size of your current tires
  • Look for the size on the driver’s side door jamb or inside the glove box door

You’ll find a series of numbers and symbols similar to P215/60 R17 S. These are the most important figures to pay attention to.      

Once you know the tire size you need, you can narrow down your options and shop tires by size.

If you’re still unsure, ask a Tires Plus technician to confirm the right size before you buy a new set.

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How To Read Your Tire Size

Want to know how to read the rest of the information included in your tire number? Each letter and number set represents certain features of a tire’s build and performance. It’s helpful to be able to read your entire tire size so you can accurately compare the grade and performance of your current tires against a new set. Here’s how to read tire sizes for any vehicle.

Example: P215/65 R15 95H

P Tire class
215 Tire width in millimeters; indicates how much of your wheel is in contact with the road.
65 Aspect ratio
R Tire construction
15 Wheel diameter size; indicates what size rim you will need
95 Load index
H Speed rating

Tire class | P 215/65 R15 95H

Indicates which type of vehicle the tire is built for. The most common tires for the average drivers include:
P: passenger car (cars, SUVs, light pickups ½ ton and under)
LT: light truck (SUVs, pickups and vans ¾ ton or larger)

 

Tire width | P 215/65 R15 95H

The width, measured in millimeters, indicates how much of your tire is in contact with the road. 

 

Aspect ratio | P 215 65 R15 95H

Percentage ratio of a tire’s height to its width. 

 

Tire construction | P 215/65 R15 95H

Specifies how the cord plies that shape and strengthen a tire are arranged. Radial cord plies (R) are the standard today, but some tires have diagonal or bias cord plies (D).

Wheel diameter/size | P 215/65 R15 95H

Also known as rim size. For example, a tire with a 15” wheel size will fit onto a wheel rim with a 15” diameter.

 

Load index | P 215/65 R15 95H

The maximum weight a tire can carry. Most passenger vehicles' load index rating fall somewhere between 75 and 100. This number corresponds to the weight load the tires can carry. For example, 95  means the tires can support up to 1520 lbs.

 

Speed rating | P 215/65 R15 95H

The maximum service speed for a tire rated by class. Ranges from lower speed ratings for winter tires and passenger vehicles to higher ratings for performance vehicles. Some common speed ratings for tires include:
H: 210 km/h (130 mph), common for passenger cars or sports cars
S: 180 km/h (112 mph), common for sedans, minivans or light trucks
T: 190 km/h (118 mph), common for sedans, minivans or light trucks

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