How do you know what size tire to get for your rims


Explaining Wheel Sizes: What to Know About Your Rims

The wheels that came installed on your vehicle are designed to perfectly fit your vehicle’s suspension, gearing, and bodywork which can affect ride quality and vehicle performance. But that doesn’t mean you can’t have different wheels or rims installed on your car or truck. To understand what wheels will work for your vehicle, we’ll take a look at rim sizes and some basic measurements.


Why Change Your Wheels

There are many reasons you might want to switch out your rims. Maybe you want an extra set of wheels and tires for easy installation every winter, or you’re looking for added performance and handling. You might even be going for a specific look, including sleek and stylish or rugged and cool. Whatever your reason, it’s important to note that getting the wrong wheel setup could cause a vibration, or some rubbing on suspension components or vehicle body parts.

Les Schwab Tip: Before you change the tire sidewall height, tread width, or rim size on your vehicle, talk to the experts first. We’ll help translate the difference in RPM, tire speed, load index, and speed rating and how it will or will not fit with your vehicle’s suspension, gearing, and bodywork.


How to Read Your Tire and Find Your Rim Size

First, start with the wheel size for your vehicle. You can find that on the sidewall of the tires on your original wheels or the inside frame of the driver’s door. Check out Tire Size Explained (Reading the Sidewall) for more.

The wheel diameter (in inches or millimeters) is the fifth set of numbers and letters. What do rim size numbers mean? This number represents the distance between the two bead seat areas where the tire is sealed onto the wheel.

The wheel size also includes its width and offset. The width is the distance from each bead seat (from inside to the outside). The offset determines how the wheel and tire set aligns with the wheel well.


Offset and Backspace Explained

The offset is how far inward or outward the mounting surface is in reference to the center-line of the wheel. The center-line is calculated by simply dividing the wheel into two equal halves. Les Schwab has the tools to accurately measure your center-line.

The offset is how far inward or outward the mounting surface is in reference to the center-line of the wheel.

Here's how offset determines the look of your rims. If the hub mounting surface is in front of the center-line, your rims and tire will be pulled inward. This is called positive offset.

If they are behind the centerline, your rims and tire will stick out from the body of the vehicle. This is negative offset.

Les Schwab Tip: Measuring the offset on your vehicle is difficult without removing the tire and wheel. Consult the pros to get the right fit.


Fitment is Fundamental

To ensure a set of rims fit properly on your vehicle, you’ll need the hub size on your car or truck as well as the wheel center bore measurement and number of wheel studs (as well as the distance between those studs). Les Schwab has those measurements for your vehicle, including bolt patterns.


Understanding Bolt Patterns On Your Wheels

Most vehicles come with a 4-, 5-, 6-, or 8-lug pattern. These bolt patterns, which are specifically spaced, help narrow your wheel or rim choices. While counting the number of bolts on your vehicle is important before buying a set of rims, it’s vital the wheels you choose match the spacing between the wheel studs on your vehicle.

To measure a 4-lug pattern on a set of rims, measure from the center of two holes across from each other. For a 5-lug pattern, measure from the outside of one wheel stud hole and the center of the opposite. And for 6- and 8-lug patterns, measure from the center of one hole to the center of the opposite wheel stud hole. You’ll either need this measurement in inches or millimeters, depending on the wheel manufacturer.

Remember, there’s no need to take these measurements on your own. The pros at Les Schwab do it every day and can ensure you get the right rims for your vehicle.


Les Schwab Carries Custom Wheels

At Les Schwab, we take pride in our custom wheel expertise. Stop by and ask about new wheels for your vehicle. We’ll show you all of your options, whether you’re going for a new look, a boost in performance, a new set of wheels for your winter tires, or simply as a replacement of your current set.

Find A Store Near You

How to Read Tire Size

Installing the right tires on your vehicle is essential to the overall performance and safety of your vehicle. Your tire choice should reflect the conditions in which you drive and your preferences for vehicle response and handling. To make the most informed decision, though, you must understand how to read tire size when it's time to buy tires.

Thankfully, determining the correct tire size for your vehicle is relatively simple. All the information you need is immediately available either in your owner's manual or somewhere on the vehicle itself. Already know how to read tire size numbers? Skip the explanation and find the right Bridgestone tire for your vehicle online or by visiting a Bridgestone tire dealer near you.

While actual, physical measurements like width and diameter are factors in finding the right tire size, there are additional details to consider. Knowing how to read car tire sizes also means understanding terms like load index and speed rating that affect your vehicle's overall capabilities.

WHERE TO FIND A CAR TIRE SIZE

No matter what vehicle you drive, finding the manufacturer-recommended tire size should be easy. The best place to start looking is the owner's manual.

Don't worry if you can't locate the manual; you may also find a tire fit guide in these locations:

  • The driver's side door jamb
  • Inside your glove box door
  • Within your gas tank hatch

You can also find tire size data on the sidewall of your current tires (assuming they're the proper size). However, no matter where you find your tire size, you will have to decipher a sequence of numbers and letters. Don't worry if it looks confusing at first — every letter and number has a straightforward meaning. Let's break down how to read car tire size.

HOW TO READ TIRE SIZE

Let's take a look at what each number or letter stands for, one by one, in the order they appear in your tire size data. We'll be using this tire size as an example: P225/70R16 91S.

THE LETTERS "P" AND "LT"

For most vehicles, you'll see the letter "P" before the number sequence begins: P225/70R16 91S. The "P" is short for "P-metric," which is a designation by the Tire and Rim Association for a "passenger car" tire type. A "P" signifies the tire was designed to primarily be used on passenger vehicles, which can include cars, minivans, SUV's and other light-duty pickup trucks.

If you see "LT" instead of "P," it's because you need "light truck" tires – "LT" is short for "LT-metric," which is a designation by the Tire and Rim Association for a "light truck" type tire. Light truck tires are designed to be used on vehicles capable of carrying heavy cargo or pulling trailers.

Similarly, "T" stands for "temporary" and is for your spare tire. If you see "ST," that means "special trailer." A special trailer tire is never installed on the drive or steer wheels. It's only intended for use on trailer axles.

WIDTH

The first number to appear in your tire size information is the width, in millimeters, of the correct tires for your vehicle: P225/70R16 91S.

Tire width always refers to the measurement from one sidewall to another. Thus, a tire with the measurement "P225" is for a passenger vehicle and has a nominal width of 225 millimeters.

ASPECT RATIO

After the slash mark, the next number you see is for the tire's aspect ratio, which essentially tells you how tall your tire's profile is: P225/70R16 91S. Aspect ratios are delivered in percentages. Tire makers calculate the aspect ratio by dividing a tire's sidewall height by its width. If a tire has an aspect ratio of 70, it means the tire's height is 70% of its width.

Lower aspect ratio tires, such as a 60 series, generally offer vehicle handling performance advantages over higher aspect ratio tires, such as a 75 series.

CONSTRUCTION

After the aspect ratio comes a letter to indicate the tire's construction: P225/70R16 91S. "R" refers to the internal structure of your tire and gives you a general idea of its stability.

There are two types of construction that you may see on the sidewall of a tire

  • R - Radial 
  • D - Diagonal or Bias Ply

"Bias-ply" tires were used on automobiles and light trucks until the '70s," reports the classic car site, Hemmings. But radial tires represent the vast majority of tires on the road in the United States today. In fact, you will almost always see the letter "R" on tires as radial tires have been the industry standard for over 40 years. Radial construction means the tire's internal ply cords are oriented in a radial direction (at 90 degrees to the centerline of the tread).

RIM DIAMETER

The next number is the wheel’s diameter. For example, a tire with the P225/70R16 91S would fit a rim with a 16-inch diameter.

Take note: if you decide to change your rims' size, you will also need to get new tires that are compatible with the change in size. Tires designed to fit a 16-inch wheel diameter will not stretch to fit on new 18-inch rims.

View Other Common Diameter Sizes:

    14-Inch Diameter Tires

    15-Inch Diameter Tires

    17-Inch Diameter Tires

    18-Inch Diameter Tires

    19-Inch Diameter Tires

    20-Inch Diameter Tires

    21-Inch Diameter Tires

    22-Inch Diameter Tires

    LOAD INDEX

    The next figure needed to read tire size numbers is your tire's load index. The load index tells us how much weight, in pounds, the tire can support when fully inflated: P225/70R16 91S.

    It is called the load "index" because the figure doesn't tell us the precise number of pounds the tire can support, at least not by itself. Instead, the number corresponds to a specific load capacity listed in an index. Beginning with one and ending with 150, numbers in the load index represent carrying capacities of 99 to 7385 lbs.

    Additionally, you may not find this number present on all tires. This is because the load index is not required by law to be printed on tires. If there is no load index measurement on your tires, check the owner's manual or contact your local Bridgestone tire dealer for more information.

    SPEED RATING

    The final figure in a tire size sequence is the speed rating indicated by a letter: P225/70R16 91S. Just as your load index number corresponds to a particular load, your speed rating letter corresponds to a specific speed capability based on a standardized laboratory test.

    For example, a tire with a speed rating "S" is rated for up to 112 mph, while a tire rated "R" is up to 106 mph. Remember that this isn't a recommended cruising speed, but rather the maximum speed that tire type can withstand. Of course, you should always follow legal speed limits on roadways.

    Here are the most common letters for speed ratings and their corresponding maximum speeds:

    • Q: 99 mph
    • R: 106 mph
    • S: 112 mph
    • T: 118 mph
    • U: 124 mph
    • H: 130 mph
    • V: 149 mph
    • W: 168 mph
    • Y: 186 mph
    • ZR: 186+ mph

    Tires with higher speed ratings tend to offer increased handling performance. Replacement tires must have the same or higher speed rating to maintain vehicle speed capability. If a vehicle has tires with different speed ratings, the speed rating of the "slowest" tire dictates the vehicle's top speed.

    Like the load index, the speed rating is not required by law to be listed on all tires. If your tires do not have the speed rating listed, your owner's manual will have the relevant information for your model's stock tire type.

    SEVERE SNOW CONDITIONS

    You may find "M+S" or "M/S" after the main tire size sequence on some tires. This indicates that the tire has some capacity to handle snow and mud conditions. This indication is common on most radial or "R" type tires.

    USDOT TIRE IDENTIFICATION NUMBER

    You may notice another set of letters and numbers on your tire's sidewall beginning with "DOT." This is not an indication of tire size, but rather that the tire complies with Federal Motor Vehicle Safety Standards. The "DOT" stands for Department of Transportation and is followed by the tire identification number. 

    The first two letters or numbers after DOT refer to the manufacturing plant where the tire was produced and the last four numbers indicate the week and year the tire was made. The numbers 4318, for instance, indicate that the tire was manufactured during the 43rd week of 2018.

    CAN I PUT LARGER TIRES ON MY CAR?

    While it's certainly possible to upgrade your tires' size, it's usually best to stick to your manufacturer-recommended tire size for optimal performance. Increasing the size of your tires may give your car more ground clearance, but it may also affect handling, drivetrain performance and fuel economy. Keep in mind the changes to key figures mentioned above, such as load index and speed rating, and how they may affect your vehicle's capabilities if you decide to increase tire size.

    SHOP TIRES BY SIZE

    Once you know how to read the numbers on tires, you can explore tires by size and narrow down your tire options quickly. Compare tire sizes online or visit a Bridgestone tire dealer near you for help.

    Correspondence of the sizes of tires and disks on passenger cars

    The issue of selecting tires for disks has always been relevant for motorists, since every self-respecting driver needs to know certain parameters. If the characteristics are not known and these parameters are not followed, the car will experience a significant deterioration in performance, which seriously threatens safety.

    In order to match rubber to the wheels as accurately as possible, you should first study the marking of the wheels:

    Wheel marking with dimensions R13 4x98 ET35 J5 D58. 6

    It is the latter that plays a major role in matching tires and wheels. In order to choose the right wheels for tires on passenger cars, you can use the table compiled by the specialists of Avtotire Kom. Or you can use the selection of discs for the car by clicking on the link .

    Tire/Rim Matching Chart

    Disc diameter Tire size Wheel rim width (inches)
    Minimum Recommended Maximum
    13" 135/80R13 3.5 3.5 4.5
    145/80R13 3.5 4 5
    155/80R13 3 4. 5 5
    165/80R13 4 4.5 5.5
    165R13 4.5 5 6
    14" 175/80R14 4.5 5 6
    185/80R14 4.5 5 6
    13" 135/70R13 3.5 4 4.5
    145/70R13 3.5 4.5 5
    155/70R13 4 4.5 5
    165/70R13 4 5 5. 5
    175/70R13 4.5 5 6
    185/70R13 4.5 5.5 6
    14" 165/70R14 4 5 5.5
    175/70R14 4.5 5 6
    185/70R14 4.5 5.5 6
    195/70R14 5 6 6.5
    13" 155/65R13 4.5 4.5 5.5
    165/65R13 4. 5 5 6
    175/65R13 5 5 6
    14" 155/65R14 4.5 4.5 5.5
    165/65R14 4.5 5 6
    175/65R14 5 5 6
    185/65R14 5 5.5 6.5
    195/65R14 5.5 6 7
    15" 145/65R15 4 4.5 5
    155/65R15 4. 5 4.5 5
    165/65R15 4.5 5 6
    175/65R15 5 5 6
    185/65R15 5 5.5 6.5
    195/65R15 5.5 6 7
    205/65R15 5.5 6 7.5
    215/65R15 6 6.5 7.5
    16" 215/65R16 6 6.5 7.5
    17" 235/65R17 6. 5 7 8.5
    18" 235/65R18 6.5 7 8.5
    14" 165/60R14 4.5 5 6
    175/60R14 5 5 6
    185/60R14 5 5.5 6.5
    195/60R14 5.5 6 7
    15" 175/60R15 5 5 6
    185/60R15 5 5. 5 6.5
    195/60R15 5.5 6 7
    205/60R15 5.5 6 7.5
    225/60R15 6 6.5 8
    16" 205/60R16 5.5 6 7.5
    215/60R16 6 6.5 7.5
    225/60R16 6 6.5 8
    235/60R16 6.5 7 8.5
    17" 225/60R17 6 6. 5 8
    14" 185/55R14 5 6 6.5
    15" 175/55R15 5 5.5 6
    185/55R15 5 6 6.5
    195/55R15 5.5 6 7
    205/55R15 5.5 6.5 7.5
    225/55R15 6 7 8
    16" 195/55R16 5. 5 6 7
    205/55R16 5.5 6.5 7.5
    215/55R16 6 7 7.5
    225/55R16 6 7 8
    245/55R16 7 7.5 8.5
    17" 205/55R17 5.5 6.5 7.5
    215/55R17 6 7 7.5
    225/55R17 6 7 8
    235/55R17 6. 5 7.5 8.5
    245/55R17 7 7.5 8.5
    255/55R17 7 8 9
    15" 195/50R15 5.5 6 7
    205/50R15 5.5 6.5 7.5
    225/50R15 6 7 8
    16" 185/50R16 5 6 6.5
    195/50R16 5.5 6 7
    205/50R16 5. 5 6.5 7.5
    215/50R16 6 7 7.5
    225/50R16 6 7 8
    235/50R16 6.5 7.5 8.5
    245/50R16 7 7.5 8.5
    255/50R16 7 8 9
    17" 205/50R17 5.5 6.5 7.5
    215/50R17 6 7 7.5
    225/50R17 6 7 8
    235/50R17 6. 5 7.5 8.5
    18" 235/50R18 6.5 7.5 8.5
    245/50R18 7 7.5 8.5
    19" 275/50R19 7.5 8.5 9.5
    15" 195/45R15 6 6.5 7.5
    16" 195/45R16 6 6.5 7.5
    205/45R16 6.5 7 7.5
    215/45R16 7 7 8
    225/45R16 7 7. 5 8.5
    245/45R16 7.5 8 9
    17" 205/45R17 6.5 7 7.5
    215/45R17 7 7 8
    225/45R17 7 7.5 8.5
    235/45R17 7.5 8 9
    245/45R17 7.5 8 9
    255/45R17 8 8.5 9.5
    18" 215/45R18 7 7 8
    225/45R18 7 7. 5 8.5
    235/45R18 7.5 8 9
    245/45R18 7.5 8 9
    255/45R18 8 8.5 9.5
    275/45R18 8.5 9 10.5
    19" 245/45R19 7.5 8 9
    20" 275/45R20 8.5 9 10.5
    16" 215/40R16 7 7. 5 8.5
    17" 205/40R17 7 7.5 8
    215/40R17 7 7.5 8.5
    235/40R17 8 8.5 9.5
    245/40R17 8 8.5 9.5
    255/40R17 8.5 9 10
    265/40R17 9 9.5 10.5
    275/40R17 9 9.5 11
    285/40R17 9 10 11
    18" 205/40R18 7 7. 5 8
    225/40R18 7.5 8 9
    235/40R18 8 8.5 9.5
    245/40R18 8 8.5 9.5
    255/40R18 8.5 9 10
    265/40R18 9 9.5 10.5
    275/40R18 9 9.5 11
    285/40R18 9.5 10 11
    19" 225/40R19 7. 5 8 9
    245/40R19 8 8.5 9.5
    255/40R19 8.5 9 10
    275/40R19 9 9.5 11
    20" 245/40R20 8 8.5 9.5
    17" 225/35R17 7.5 8 9
    265/35R17 9 9.5 10.5
    335/35R17 11 12 13
    18" 215/35R18 7 7. 5 8.5
    225/35R18 7.5 8 9
    235/35R18 8 8.5 9.5
    255/35R18 8.5 9 10
    265/35R18 9 9.5 10.5
    275/35R18 9 9.5 11
    285/35R18 9.5 10 11
    295/35R18 10 10.5 11.5
    345/35R18 11. 5 12 13.5
    19" 225/35R19 7.5 8 9
    235/35R19 8 8.5 9.5
    245/35R19 8 8.5 9.5
    255/35R19 8.5 9 10
    265/35R19 9 9.5 10.5
    275/35R19 9 9.5 11
    285/35R19 9.5 10 11
    295/35R19 10 10. 5 11.5
    20" 245/35R20 8 8.5 9.5
    255/35R20 8.5 9 10
    275/35R20 9 9.5 11
    21" 245/35R21 8 8.5 9.5
    255/35R21 8.5 9 10
    18" 285/30R18 9.5 10 10.5
    295/30R18 10 10. 5 11
    315/30R18 10.5 11 11.5
    335/30R18 11.5 12 12.5
    345/30R18 11.5 12 12.5
    19" 265/30R19 9 9.5 10
    275/30R19 9 9.5 10
    285/30R19 9.5 10 10.5
    295/30R19 10 10.5 11
    305/30R19 10. 5 11 11.5
    345/30R19 11.5 12 12.5
    20" 235/30R20 8.5 8.5 9.5
    245/30R20 8.5 8.5 9.5
    255/30R20 9 9 10
    285/30R20 10 10 11
    335/30R20 12 12 13
    21" 255/30R21 9 9 10
    285/30R21 10 10 11
    295/30R21 10 10. 5 11
    22" 255/30R22 9 9 10
    19" 315/25R19 11 11.5 12
    20" 285/25R20 10.5
    295/25R20 10 10.5 11
    325/25R20 11.5 12 12.5
    21" 295/25R21 10 10.5 11
    22" 295/25R22 10 10. 5 11

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    How to find out the correct tire size for your car?

    29.06.2019

    Author: Sergey Akhmetov

    Views: 33377

    If you don't know what size of tires should be on your car or are not sure that the size recommended by the manufacturer is currently installed on it, then you are at the right place.

    Here are 7 ways to find out the correct tire size for your car:

    1. View the size on the sidewall of the tire that is currently installed on the car

    You can read how it looks and how to read the designations on tires correctly in our article “Tyre marking: basic parameters”. This method is suitable if you know that the car has factory tires or that the car is still under warranty. Otherwise, read on.

    2. See the recommended tire sizes depending on the car model:

    - on the inside of the glove compartment

    - on the end of the driver's door

    - on the side of the car

    - on the inside of the gas tank hatch

    3. Look at the operating manual of your car

    as As a rule, the relevant section (Chassis, Tires / Wheels, etc.) contains information on the permissible rubber sizes.

    4. Look at the website of the car manufacturer or its dealer

    This method may suit you if the car is still being produced and sold. In this situation, data on the sizes of tires and wheels, as a rule, is contained in the "Technical Specifications" or "Car Equipment" section.

    5. Call the official service that serves your brand of car

    other car. The same applies to absolutely new models on the market - especially Chinese ones. Sometimes, except for the "officials", no one knows what tires and wheels can be put on them.

    6. Use the selection of tires by car brand

    Specialized online stores have the service "Selection of tires by car brand", which allows you to immediately determine by manufacturer, model, year and engine size which tire sizes and for which diameter can be put on the car. Here you can see not only your factory size, but also alternative options, if, for example, there is a need to switch to smaller / larger diameter rims, install tires of different widths, etc.

    7. Find information on the forum of the owners of your car model

    It is often on the forums of car owners that you can quickly find all the necessary information not only on tires, but also on many other issues.


    Learn more