The first and second columns contain standard sizes of tires and disks. In the remaining columns, the dimensions desired for installation. The calculator will help determine tolerances and selection alternatives.
Tire Calculator allows you to compare the dimensions of tires of different sizes. For example, choose wider tires, but keep the outer diameter of the wheel the same or find out how much the car's ground clearance will change if you put tires of a different profile.
To select an alternative size in one half of the calculator, you need to specify the standard or existing tire size, in the next half - the desired or alternative.
The calculator displays the recommended rim width for a particular tire size, as well as the outer diameter and wheel width. Most important parameter is the outside diameter of the wheel. You should pay the most attention to its change.
The second important parameter is the actual height of the tire profile. It is usually expressed as a percentage of the width: for example, 205/55 R16, where 55 is 55% of the tire's width. That is, 205*55/100=112.75 mm is the actual profile height of this tire.
Tires of different widths, standardly installed on a car, have different profile heights in percent, but the same in millimeters. For example, tires with dimensions 275/40 R20 and 315/35 R20 have a profile height of 110 and 110.25 mm, respectively.
Some features of the selection of tires:
- The wider the tires, the better handling, but less hydroplaning resistance and more rutting, and reduced comfort - low profile tires are stiffer.
- Lower profile - heavier wheel. This is due to the fact that the disk is heavier than rubber, the mass of the wheel increases and this worsens the performance of the suspension. In addition, the mass of metal is distributed closer to the outer edge of the wheel and increases the moment of inertia (for cars with a powerful engine, this is not essential).
- With an increase in the profile, the car becomes more rolly, it reacts worse to control, but it goes through bumps more easily, the tires are less sensitive to the sharp edges of the pits, and comfort becomes better.
- A significant change in the outer diameter of the wheel leads to a distortion of the readings of the car's instruments, in particular, mileage and speed.
Our tire calculator - professional calculations in no time!
Car tires are indispensable components of any car. They are able to ensure road safety, as well as the implementation specifications, which were originally declared by the manufacturer. Every year drivers need to change summer tires for winter and vice versa. It is recommended to select tires with the dimensions that were provided automobile company for a particular vehicle model.
Today on automotive market offers a wide range of tires, which are produced by different manufacturers. Among themselves, they differ not only in materials of manufacture and design, but also in size. Each car model has its own type of tires that are optimally combined with each other.
Tire dimensions mean, as a rule, three parameters - this is the height (the distance between the inner rim and ground), tread width, and inner hole diameter (where the disc is placed). It should be noted that the manufacturer when determining the dimensions car tires takes into account their mass, traction, power, width and purpose of use. If even a slight deviation in tire sizes from the standard is allowed, this can lead to a number of changes, both positive and negative. For example, such as comfort while driving on a highway or dirt road, speedometer readings, fuel consumption and much more. It is for these reasons that changing factory tire sizes must be approached with special care, because the consequences can be unpredictable.
What is a visual tire calculator and what is it for?
Now it is quite simple to correctly determine the size of car tires. All you have to do is use the visual tire calculator. With it, the driver will be able to foresee all the nuances in order to avoid trouble in the future. Also, the calculator will allow you to calculate several options in advance in order to make the next purchase correctly. This application shows the results online, so you can get the result in seconds. Also, the tire calculator will give the most accurate answer, taking into account the speedometer readings, fuel consumption, noise, road conditions, etc. The driver, first of all, needs to focus on the manufacturer's recommendations and select tires depending on the car model, as well as factory and recommended sizes .
Finding tire sizes with a tire calculator
- Select the wheel or tire sizes that will appear from the drop-down list.
- Take a look at the table below for possible options replacements.
- From the drop-down list, you need to specify the size of the disk or tire for the replacement option.
- A visual tire calculator online will perform the calculation and give the user basic recommendations for the parameters that were specified.
It is worth noting that sometimes the tire calculator does not always offer replacement options, so you can always get advice from an online manager who will answer all your questions.
Thus, the tire calculator will help you correctly calculate the dimensions of a car tire to replace it. If the driver decides to change the factory settings, then this service will provide important recommendations regarding tire performance modifications.
The visual tire calculator will help you complete all tasks in seconds. The service is available at any time of the day. You can use the calculator not only through a personal computer, but also through laptops, tablets and smartphones.
Car owners use a tire calculator to select tires and rims suitable size. All calculations are done online. The user does not have to deal with lengthy, incomprehensible calculations. The application is multifunctional, since the motorist will be able to understand how to change the dimensions of the wheel, taking into account changes in the size of tires and wheels. Consider the features of using the service.
Tire calculator functionality
To help with the selection of tires suitable for a particular car in terms of size and characteristics, the tire selection calculator can. Vehicle owners resort to the services of the service when it is time to replace the tires and wheels on the vehicle. In order not to waste time on meaningless "changing shoes", checks, use the proposed online service. Tire calculator features:
- you can calculate the size of tires;
- the service provides different parameters - wheel diameters, changes in the height of the clearance between the road and the car (clearance), track expansion;
- help in converting inches to millimeters or vice versa, using the American and European size charts.
The tire calculator has been designed to speed up the selection of tires, making the procedure much easier. Since every owner of a car faced the difficulties of choosing, online calculators very quickly gained popularity among users.
How to use the tire calculator
There are several tips to help you use the tire size calculator for its intended purpose. Step-by-step instruction consists of the following steps:
- In the form you will need to enter the size of the tires installed on the car, as well as those that you would like to install.
- The user will see a special table with the results of calculations. From this data, it will be possible to find out which tires are needed for a particular vehicle.
- After selecting tires, you can proceed to the calculation of the size of the disks. Here you will need to set the exact data - the maximum / minimum width of the disk installed on the car. All calculations will be performed automatically.
- If you need to convert inches to millimeters, you can use the online converter. This action will allow you to find analogues with American sizes and with European ones. Comparison through the tire calculator will be as accurate as possible, since all the necessary information has been entered into the online service database.
The general selection procedure is very simple, but the owner of the car will definitely need to enter the initial data. The parameters should be as accurate as possible so that there are no errors or inaccuracies in subsequent results.
You can use this service on our website. The program is freely available, anyone can make calculations in a few minutes. To simplify the process of use, it is worth using the instructions given.
What is a tire calculator for?
With this tire calculator you can easily calculate how to change: outer dimensions of the wheel, height ground clearance(clearance), speedometer readings and other characteristics when tires with a different size are installed on your car.
Old tire size
Width
Height
Diameter
New tire size
Width
Select 5.0 5.5 6.0 6.5 7.0 7.5 8.5 9.5 10.5 11.5 12.0 12.5 13.0 13.5 14.5 125 135 145 155 165 175 185 195 205 215 225 235 245 255 265 275 285 295 305 315 325 335 345 355 365
Height
Select 25 27 30 31 32 33 34 35 38 38.5 40 45 50 55 60 65 70 75 80 85 90
Diameter
Select 12 13 14 15 16 16.5 17 17.5 18 19 20 21 22 23 24 25 26 28 30 32
First enter the standard size installed on your car, and then the one you want to install.
The difference between the speedometer and the actual speed depends on the speed of the car, the higher the speed, the greater the difference
| External dimensions | Old | New | Difference | ||
|---|---|---|---|---|---|
| Tire width, mm (A) | 0 | 0 | 0 | ||
| Profile height, mm (B) | 0 | 0 | 0 | ||
| Disc diameter, mm (C) | 0 | 0 | 0 | ||
| External diameter, mm (D) | 0 | 0 | 0 | ||
| Change in ground clearance, mm | 0 |
The site of the online store contains a convenient tire calculator that makes it easy to calculate changes in wheel parameters when switching to another tire size. With this online tool, you can calculate external wheel measurements, ground clearance (ride height), calculate speedometer readings and other characteristics.
With the onset of the new season, every responsible car owner considers it necessary to change tires in accordance with the season. The best option will install tires of the size recommended by the automaker for a particular brand of car. In cases where this is not possible, deviations in diameter in the 2% range are allowed.
Replacing tires requires a serious approach. When choosing new tires and wheels, it is necessary to take into account such indicators as:
- tire width,
- profile height,
- wheel inner diameter,
- valid speed indices.
Incorrectly selected tires can cause malfunctions in the car's electronics, increase fuel consumption, worsen driving comfort, and also cause problems during a vehicle inspection at the traffic police.
How to calculate tires?
To select the tires of the required size, you need to use the tire calculator, which determines the theoretical dimensions. All measurements are in millimeters and speed is in km/h. To make a calculation, you should enter the parameters of the tires of your car in the appropriate line. Then enter dimensions new tire and the disk to be installed. After specifying all the parameters in the table below, information will appear on changes in the tire width and profile height, inner and outer diameters, and the difference in speeds (real and according to the speedometer).
What to look for when choosing a tire
- Installing tires and rims custom size can lead to damage to the tire itself, damage to the disc and reduce the performance of the car. When choosing tires, it is better to rely on the recommendations of the automaker.
- If the diameter of the wheel disc is larger, then in this case the load on the suspension may increase. To maintain the same diameter of the outer wheel, the height of the profile should be reduced.
- If you choose tires with a greatly increased profile, you need to be prepared for a loss in the quality of car handling. The tire can rub against the body and suspension, causing rapid wear.
- Even with the slightest difference between the indicators on the speedometer and in reality, the error can increase many times with an increase in speed, which makes driving unsafe.
- Narrow or too wide rims can cause tire deformation. This, in turn, will lead to premature wear and deterioration of performance.
Tires of American and European production differ in marking. Often a situation arises when it is necessary to convert inches to centimeters. In this article, we will describe how to decipher tire sizes in centimeters.
Metric tire marking
The main dimensions of tires are prescribed by marking, these include:
- Tire profile width - the distance, expressed in millimeters or inches, between the outer sides of the sidewalls of an inflated tire, excluding elevations, trim or belts. The specified value should not exceed the product rim width by more than 30%.
- Tire series. Specifies the ratio of the width and height of the product profile. Allows you to distinguish rubber in this way:
- low profile - series less than 70%;
- high profile - in the range of 70-82%;
- full profile - more than 85%.
- Tire construction. There are radial and diagonal tires. In the first case, the fibers of the cord layer are placed perpendicular to the circumference of the wheel. In the second variant, the cord threads are overlapped. Radial tire design is more common, these tires provide better wheel traction. pavement they are more reliable in operation.
- wheel radius.
How to understand what tire markings mean? The designations on the side of automobile rubber are applied by tire manufacturers. Factory marking is in metric or inch system. For example, the size of tires marked with the metric system 265/75 R15 corresponds to the designation of the inch system 31 × 10.5 R15. The interpretation of these designations in centimeters means:
- The designation 265/75 R15 indicates the dimensions of the tire:
- 265 - a figure that determines the width of the tire (one centimeter is equal to ten millimeters, 265 mm = 26.5 cm);
- 75 is the percentage (75%) that determines the relationship between the height of the tire profile and the width of the rubber (265 * 0.75 \u003d 198.8 mm or 19.9 cm), the number found indicates the height of the tire profile;
- R - denotes the radial type of tires;
- 15 - wheel diameter, the size is indicated in inches, you can convert the indicated parameter into centimeters by multiplying the digital value of interest by 2.54, since 1 inch is 2.54 cm, as a result we get 15 * 2.54 \u003d 38.1.
- The designation 31 × 10.5 R15 stands for:
- 31 - wheel height (31 inches or 31 * 2.54 = 78.7 cm);
- 10.5 - tire width (10.5 inches or 10.5 * 2.54 \u003d 26.7 cm);
- R - indicates the radial type of tires;
- 15 - determines the diameter of the wheel (15 inches or 15 * 2.54 = 38.1 cm).
- subtract its radius from the total height of the tire (78.7-38.1 \u003d 40.6 cm);
- divide the resulting value by 2 (40.6 / 2 \u003d 20.3 cm).
Differences in the marking of tires
Tire marking with inch system When deciphering tire sizes, pay attention to the letter in front of the tire dimensions:
- "P" - indicates the "P-metric" system used for minivans, light pickups (with a carrying capacity of up to 0.5 tons). This system is very convenient, it is often used by tire manufacturers.
- "T" - "spare" tires are marked with the indicated letter: rubber can be used until the main tire is repaired or replaced.
- "LT" stands for "Light Truck-metric" system, designed for trucks and vehicles capable of transporting large loads. Vehicles with a load capacity of up to 1 ton fall into this category.
- "ST" - indicates "Special Trailer Service", products are designed for trailers, they can also be used to transport boats or cars.
Letter values can be at the end of the tire marking, in which case they mean:
- "LT" - the tire refers to products with early marking:
- "Numeric" - numerical, tires are designed for vehicles transporting heavy loads, trailers
- "Wide Base" - tires with a wide base, manufacturers make such products with a rim diameter of 16.5 inches;
- "Flotation" - flotation, large-sized tires that allow the car to move on a sandy surface or mud.
- "C" is a commercial tire used for vans and distribution vehicles capable of transporting large loads.
If at the beginning of the marking there is no letter designation and a three-digit number, for example, 45R15, then this is a tire with a metric size of the Euro-metric system applicable on tires of European manufacturers. The indicated dimension corresponds to the decoding according to the P-metric system, but differs in smaller loads.
- 235 - product width (235 mm = 23.5 cm);
- 710 - a figure indicating the outer diameter of the tire (710 mm \u003d 71.0 cm);
- 460 - tire rim diameter (460 mm = 46 cm);
- A - the designation of asymmetric rubber sides, for example, 460A means that the outer side has a diameter of 45 cm, and the inner one is 47 cm.
Such non-standard markings are designed for vehicles with wheels of a specific size that differ in side profiles from standard metric or inch products. Faced with non-standard markings, it is better to find out their decoding from the tire manufacturer.
Comparison of calculated data
Dimensions requested by the tire calculator to perform calculations Independent decoding of tire sizes requires a certain accuracy of calculations. You can check whether the conversion of values \u200b\u200bfrom centimeters to inches and vice versa is done correctly using tire calculators. With their help, you can also find out how many tire sizes are suitable for a particular car model.
Tire calculators are easy to find on the Internet, they usually have American and European systems of sizes at the same time. Therefore, by entering the tire sizes recommended by the car manufacturer in the metric system, it is possible to get a list of American and European tires. It is very convenient, if necessary, to select the brand of rubber of interest, as well as view the possibility of changing tire sizes recommended by the manufacturer. When using tire calculators, it is necessary to take into account the error arising from rounding, so it is better to translate the dimensions of interest manually, then compare them with the options calculated by the Internet resource.
Conclusion
American labeling rubber, if you do not take into account the inches that are unusual for us, it is very convenient to use. But in most situations, you have to deal with the metric notation. Converting inch dimensions to centimeters is not difficult if you understand the decoding of the designations applied by manufacturers to the side surface of tires. In this case, it is necessary to take into account the error of calculations, which may arise due to inattention or rounding of the obtained values. To correctly calculate the dimensions, it is better to use the manual method, then compare the obtained parameters with the data of tire calculators. We do not recommend using only one method, since there is also a certain rounding error in the embedded electronic computing programs.