When replacing disks and tires, taking into account the geometric data obtained from tire calculator, it will not be superfluous to make several measurements yourself. First, the distance from the suspension to the inner surface of the wheel, and also from the shock absorber cup to the tread surface. Secondly, from the wing, as well as the steering rods to the tread surface. Wherein geometric parameters the new wheel assembly must not greatly exceed the size standard tires and disks. Otherwise, unstable behavior of the vehicle may occur.
A few basic rules to remember when changing tires and wheels.
- Tread summer tires has a standard depth of 0.8-1 cm;
- When installing discs with a larger diameter than the standard ones, it is necessary to reduce the overhang value - for every inch of height 3 mm overhang;
- It is not uncommon for the hub bores on discs that are not original to have a larger diameter. Therefore, when installing them, you need to use special rings for fixing;
- In the event that the hole on the disc is smaller than the hub mounts, it is strictly forbidden to drill them out, as well as grind the hub itself;
- Correct selection non-original disks using a calculator will allow you to save the driving characteristics of the car;
- If you are not sure about the compatibility of tires or wheels with your car, it is better not to install, or contact specialists for help.
In order to choose the right tires for the disks, you need to know certain parameters, failure to adhere to which will seriously worsen the car's behavior on the road. Since the tire is put on the rim of the rim, the width of the profile must be proportional to it. We note right away that, despite the tuning widespread in recent years, automakers categorically do not recommend it. After all, if the sizes of disks and tires are very different, then the contact patch will not be even, which means that the control may get out of control.
In general, the question of matching tires and disks can be viewed from two sides. The first is the selection of tires and wheels based on the manufacturer's recommendations, and the second is this fitment. Fitment is the study of the fit of the tire on the rim and the position of the wheels relative to the wheel arches, which includes negative camber, low landing and other delights that we will not talk about, since we consider it more important to tell how to choose the right one in terms of safety and comfort tires to disks.
In order to choose the right tires for the rims, you need to know the labeling of the rims.
Ideally, that is, to be sure of safety, PCD disc(the diameter of the circle of the centers of the mounting holes) must not be changed. In an extreme case, the dimensions of the rims and tires may not match at all, but then eccentric bolts are used for fastening, which allow you to install rims with PCD 100 mm on cars with PCD 98 mm. However, it is worth noting that the maximum difference in displacement should not exceed 2 mm, and ideally, the alignment of tires and disks should be one hundred percent.
The dimensions of the disks and tires must also coincide with their central hole, but if for certain reasons this is not possible, an adjusting ring will come to the rescue (it is also a spacer ring). The setting ring has an outer diameter equal to the diameter of the hole in the disc, and the inner diameter corresponds to the diameter of the car hub. If the setting ring is put correctly, then the running characteristics will not change. It should be noted that the discs do not have stamped locating rings. Install them only on.
The disc markings do not indicate the maximum load ( MAX LOAD), you can find out this parameter either in the passport that some manufacturers of domestic wheels attach to their products, or look for this information on the website of the wheel manufacturer. This information is not very important, as manufacturers usually make discs with a margin of safety. But, if for some reason you decide to put, say, on the jeep discs for passenger car, then the maximum disk load will be an important parameter. And if you do not take it into account, the wheel may not withstand the load and deform, even falling into a small hole.
In addition, even if the dimensions of the tires and wheels are the same in all respects, there is still a risk that the wheel will not fit on the car. The reason for this is the so-called X-factor, when the disc rests against the suspension parts or the caliper, which is associated with the form of stamping or casting. Therefore, we recommend that you first try it on before mounting a tire on a wheel.
Correspondence table for the width of tires and rims
|
Tire height |
Tire size |
Disc width (inches) |
||
|
R12 |
||||
|
82 |
125R12 |
3,5 |
3.0 |
4.0 |
|
70 |
145 / 70R12 |
4,5 |
4.0 |
5.0 |
|
R13 |
||||
|
82 |
145R13 |
4.0 |
3,5 |
5.0 |
|
80 |
135 / 80R13 |
3,5 |
3,5 |
4,5 |
|
70 |
135 / 70R13 |
4.0 |
3,5 |
4,5 |
|
65 |
155 / 65R13 |
4,5 |
4,0 |
5,5 |
|
60 |
175 / 60R13 |
5.0 |
5.0 |
6.0 |
|
55 |
195 / 55R13 |
6,0 |
5,5 |
7,0 |
|
R14 |
||||
|
82 |
145R14 |
4,0 |
3,5 |
5,0 |
|
80 |
175 / 80R14 |
5,0 |
4,5 |
5,5 |
|
70 |
165 / 70R14 |
5,0 |
4,5 |
6,0 |
|
65 |
155 / 65R14 |
4,5 |
4,0 |
5,5 |
|
60 |
165 / 60R14 |
5,0 |
4,5 |
6,0 |
|
55 |
185 / 55R14 |
6,0 |
5,0 |
6,5 |
|
R15 |
||||
|
82 |
125R15 |
3,5 |
3,0 |
4,0 |
|
80 |
185 / 80R15 |
5,5 |
4,5 |
6,0 |
|
70 |
175 / 70R15 |
5,0 |
5,0 |
6,0 |
|
65 |
185 / 65R15 |
5,5 |
5.0 |
6,5 |
|
60 |
195 / 60R15 |
6,0 |
5,5 |
7,0 |
|
55 |
185 / 55R15 |
6,0 |
5,0 |
6,5 |
|
50 |
195 / 50R15 |
6,0 |
5,5 |
7,0 |
|
45 |
195 / 45R15 |
6,5 |
6,0 |
7,5 |
|
R16 |
||||
|
65 |
215 / 65R16 |
6,5 |
5,5 |
7,5 |
|
60 |
225 / 60R16 |
6,5 |
6,0 |
8,0 |
|
55 |
205 / 55R16 |
6,5 |
5,5 |
7,5 |
|
50 |
205 / 50R16 |
6,5 |
5,5 |
7,5 |
|
45 |
195 / 45R16 |
6,5 |
6,0 |
7,5 |
|
40 |
215 / 40R16 |
7,5 |
7,0 |
8,5 |
|
R17 |
||||
|
55 |
225 / 55R17 |
7,0 |
6,0 |
8,0 |
|
50 |
205 / 50R17 |
6,5 | ||
What is it needed for tire calculator:
With this tire calculator, you can easily calculate how the following changes will be made: wheel outer dimensions, height ground clearance(ground clearance), speedometer readings and other characteristics when installing tires with a different standard size 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 that you want to install.
The difference in speedometer readings and real 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 | ||
| Outside diameter, mm (D) | 0 | 0 | 0 | ||
| Change in ground clearance, mm | 0 |
A convenient tire calculator is placed on the website of the online store, which allows you to easily calculate the changes in wheel parameters when switching to a different tire size. With this online tool, you can calculate the external measurements of the wheel, ground clearance (ride height), calculate the 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 car brand. In cases where this is not possible, deviations in diameter in the 2% range are allowed.
Replacing rubber requires a serious approach. When choosing new tires and wheels, it is necessary to take into account such indicators as:
- tire width,
- profile height,
- inner diameter of the wheel,
- permissible speed indices.
Incorrectly selected tires can cause malfunctions in the car electronics, increase fuel consumption, deteriorate driving comfort, and also cause problems during vehicle inspection at the traffic police.
How to calculate tires?
To find the correct tire size, you need to use a tire calculator, with which the theoretical dimensions are determined. All measurements are carried out in millimeters, and the speed in km / h. To make a calculation, you must enter the parameters of the tires of your car in the appropriate line. Then enter the dimensions new tire and the disk to be installed. After specifying all the parameters in the table below, information about changes in the width of the tire and the height of the profile, the inner and outer diameter, the difference in speeds (real and according to the speedometer readings) will appear.
What to look for when choosing a tire
- Installation of tires and wheels custom size can lead to damage to the tire itself, damage to the wheel and a decrease in the performance of the car. When choosing a rubber, it is better to rely on the recommendations of the automaker.
- If the diameter of the wheel rim is larger, then the load on the suspension may increase. To maintain the same diameter of the outer wheel, the profile height should be reduced.
- If you choose tires with a greatly increased profile, you need to be prepared for a loss in the quality of the car's handling. The tire can rub against the body and suspension, causing rapid wear.
- Even with the smallest difference between the indicators on the speedometer and in reality, the error can increase significantly with increasing speed, which makes driving unsafe.
- Narrow or too wide rims can deform the tire. This, in turn, will lead to premature wear and poor performance.
Lending terms:
- Loan term: 2–36 months
- Credit limit: from 10,000 rubles. up to 300,000 rubles
- Interest rate - determined by the bank based on your data and credit history
How to place an order on credit?
To place an order on credit, just follow a few simple steps:- Decide on the product and place an order on the website or through a call-center operator
- After placing the order, the bank manager will contact you, advise on the terms of the loan and agree with you to meet to sign the contract
- Meet at a convenient time for you with a bank representative and sign the agreement
- After signing the contract, you need to wait for the bank to pay us your order. Money transfer takes 2 to 3 business days. As soon as the money is received from the bank, we will send you an SMS with an offer to pick up the order
- Come to our center with a passport and a loan agreement to receive an order
Loan conditions
- Russian citizenship with permanent registration
- Age from 18 years
- Purchase amount from 10,000 to 300,000 rubles
- Required documents: passport of the Russian Federation, SNILS
In the first and second columns, the standard sizes of tires and disks are set. In the remaining columns, the dimensions you want to install. The calculator will help you determine the tolerances and alternative options selection.
The tire calculator allows you to compare the dimensions of different tire sizes. For example, choose wider tires, but keep the outer diameter of the wheel the same, or find out how much the vehicle's ground clearance will change if tires of a different profile are installed.
To select an alternative standard size, in one half of the calculator, you need to indicate the standard or existing standard size of the tire, in the adjacent half - the desired or alternative.
The calculator displays the recommended rim width for a given tire size, as well as the outer diameter and width of the wheel. The most important parameter is the outer diameter of the wheel. You should pay the greatest attention to its change.
The second important parameter is the actual tire profile height. It is usually expressed as a percentage of the width: for example, 205/55 R16, where 55 is 55% of the tire width. That is, 205 * 55/100 = 112.75 mm is the real height of the profile of this tire.
Diversified tires that are 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 the handling, but the less resistance to aquaplaning and the more rutting is felt, as well as the reduced comfort - the low-profile tires are stiffer.
- The lower the profile is the heavier wheel. This is due to the fact that the disc is heavier than rubber, the mass of the wheel increases and this deteriorates the suspension performance. In addition, the mass of metal is distributed closer to the outer edge of the wheel and increases the moment of inertia (this is not essential for cars with a powerful engine).
- With an increase in the profile, the car becomes more roll, less responsive to control, but bumps are easier to overcome, tires are less sensitive to sharp edges of pits, and comfort becomes better.
- A significant change in the outer diameter of the wheel leads to a distortion of the readings of the vehicle's instruments, in particular, the mileage and speed.
Our tire calculator - professional calculations in no time!
