The central hole of the disk on the stamps. What to do if the DIA of the disc does not fit on the car hub

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A pressing question among motorists: “what is DIA on disks?” To ensure further operation of the vehicle, it is necessary to make the correct selection of wheel structures. After all, road safety depends on their properties. If all indicators of the wheelbase are violated, the mechanism deteriorates, and the vehicle’s controllability also deteriorates.

When it comes to purchasing new components, it is quite difficult to do without expert advice. When choosing designs for their car, many are not even familiar with the basic parameters. Therefore, before installing components on your car, you need to study all the vehicle indicators specified in the technical passport of the manufacturer.

DIA value

Their list primarily includes stem, PCD, DIA, product width, etc. Wheel marking plays an important role. Its indicator is usually indicated on the label or in the technical data sheet. This information is displayed for all types of structures in a standard format.

A is the diameter of the central hole of the disk;
B - width;
ET - the offset of the structure is used to determine the distance between the space where the rim is applied to the hub and the internal sphere of the structure.

The mating plane is the base that connects the wheel rim to the vehicle hub. When choosing designs, you should not be guided only by the external data of the components. Otherwise, you can worsen the technical condition of the vehicle, as well as its handling on smooth asphalt or off-road.

Disc overhang is divided into positive, negative and zero. In the latter option, the mating plane of the product is determined between the middle of the structure. If they coincide with each other, then the wheel type is considered zero.

Sometimes it happens that the overhang indicator is smaller, then the structure will stick out unsightly from the outside of the vehicle. However, some motorists like wide components. Therefore, they choose the first option. In the second case, everything looks different: the higher the ET value, the tighter the structure fits inside the car.

Note!

The width of the structure may differ from the disc offset value. Many manufacturers of automotive components indicate in the technical data sheet for the car that wheels with a larger width have a lower offset indicator.

PCD means the circle diameter of the wheel rim holes. This indicator determines the location of the wheel design mounting holes.

Often, beginners and even experienced drivers cannot decipher the symbols indicated on car wheels. To avoid mistakes when choosing tires, you need to carefully study all the indicators. What is DIA on disks is the diameter of the central hole. On many manufactured alloy wheels, in order to give the car a presentable appearance, the diameter of the central hole DIA is made large. To correctly select the size of a car hub, experts recommend choosing an adapter ring or bushing.

Design mounting hole

Product mounting hole

The landing diameter of the wheel rim is as follows - 7.5 j x16 H2 5/112 ET 35 d 66.6:

7.5 - width of the structure.
J is a feature of automotive designs.
x - inseparability of wheels.
16 - landing diameter.
H2 - two protrusions.
5/112 is determined by the number of mounting holes for bolts or nuts, and 112 serves as the diameter of the circle.
ET 35 - product size is 35 mm.
d 66.6 - diameter of the central hole.

Is it possible to install components with a large central hole?

Is it possible to install structures with a large CO

The question of what effect CO has on car rims remains relevant both among beginners and experienced drivers. The disc, which has a universal central diameter, is sold in all stores, as well as online resources. Modern designs that have a large central hole fit many models.

The main reason why original automobile developments are noticeably more expensive than even the highest quality non-original analogs is the requirements of automakers.

What is a central heating center on car wheels?

What does CO mean?

Many people are interested in the question of what the central hole of the disk is. This indicator determines many parameters. The vehicle's handling on icy/wet asphalt depends on this value. When choosing wheels for a car, DIA is defined as a characteristic of the wheel. Sometimes manufacturers may designate this indicator as D. Some car owners buy large mounting bolts that are not installed on the structure. All these nuances should be taken into account to ensure the safety of the driver/passenger.

What to do if the CO of the structure is greater than the CO of the hub

Difference in CO size

The diameter of the central hole of the disk must match the parameters of the diameter of the landing cylinder where the hub is located. In recent years, many manufacturers have begun to produce identical designs for several car brands at once. Therefore, when purchasing new components for a vehicle, you need to determine the compliance of this parameter.

What is a wheel hub hole

For each machine there are acceptable parameters that must be taken into account before purchasing accessories or components. For example, the parameter of wheel landing diameters plays an important role. Indicators may differ significantly from each other. The exact value can only be determined by looking at the label.

Hub hole development

The variety of diameters of the central hole confuses many buyers. A minor difference may affect the technical condition of the vehicle. For example, most often the difference is only 0.1 mm.

Motorists are often interested in the question of what Dia is in the parameters of car rims. The above-mentioned requirements of wheel product manufacturers for automobile wheels produced under their brand concern not so much their appearance as their quality.

Thus, when determining the PCD, all characteristics of the vehicle must be taken into account. Basically, tire mounting holes go on sale at a high rate.

Sometimes car owners are faced with the need to replace the wheels on their car with new ones. But as soon as you come to the store, car enthusiasts are immediately lost, such a large assortment of wheels is presented there. It is not possible to choose something specific. When choosing disks, you need to take into account a huge number of parameters. One of them is the diameter of the central hole of the disk. You can find out what it is, what it affects, what characteristics are best to choose for your car from this article.

What parameters do you need to know when selecting disks?

At first glance, it may seem that choosing a new rim for your wheel is easy. But then you come across designations of the following type: 4*108, 6S ET47, Dia 62.5, R17. Yes, this is exactly how all technical characteristics are indicated. Because disks have many parameters that need to be taken into account when purchasing. What do they include?

Disc type: cast or stamped.
Mounting holes: number and diameter.
Hub shape.
Diameter of the central hole (hub).
Disc circumference diameter.

If these nuances seem unnecessary, then any wheel shop can help you. If you want to understand all the details yourself, let’s try to understand what the diameter of the central hole of the disk is. What is this?

What is the diameter of the center hole of the disk?

This is a hole in the middle of the disk, which, despite its apparent simplicity, determines many parameters of the car. In the list of wheel characteristics, it is usually marked as Dia or simply D. It should not be confused with the PSD designation, which indicates the size of the mounting holes. The diameter of the central hole of the disk must exactly match the diameter of the landing cylinder on the hub. Often the same wheels are produced for several car brands at once, so before purchasing, you must always check that this parameter corresponds to the manufacturer’s technical specifications. The disc may not fit correctly and not hold tightly, which is why you will constantly feel vibrations and uneven wheel travel. It's even better to buy original spare parts. If this is not possible, then carefully study the options for the size of the central hole. Typically, a deviation of 2-5 mm is allowed on cast wheels and 0.01 mm on stamped ones.

What parameters are affected by the central hole?

Manufacturers of modern wheel rims are faced with a huge number of brands and models with different parameters. Naturally, producing wheels individually for each car would be pointless and very expensive. Therefore, companies take the path of least resistance: they produce wheels with the largest possible central hole. And this does not have a very good effect on the behavior of the car, especially at high speeds. What other parameters does this hole affect?

Uniform tire wear. Choosing a rim with the “wrong” center hole can result in uneven tire wear. Due to improper load distribution, the tread pattern may wear off on only one side, which will ultimately affect other characteristics of the car.
Tire service life. How long you can drive on a new set of tires depends on the right choice. Properly selected wheels increase tire life.
Steering wheel service life. If the car has developed a high enough speed, and the DIA is selected incorrectly, the steering wheel begins to “beat”, which ultimately leads to its breakdown.
Body vibration. If at speeds above 80 km/h your car begins to “shake”, then most likely the problem lies in the diameter of the central hole of the alloy disk.

What to do if the central hole of the disk is larger than the diameter of the hub?

All wheel sellers recommend testing them in a car before purchasing, and it is advisable to drive them at least a short distance. It's even better to accelerate to a speed of 60-80 km/h to understand exactly how the new wheels behave. It is difficult to install wheels with a central diameter smaller than the hub diameter on a car. Is it possible to install wheels with a larger diameter? Of course, it is best to choose a hole that is ideal for your car. If this is not possible, then you can install a so-called universal disk, with a large central hole. To do this, you need to purchase a set of adapter rings that will compensate for the difference between the hub and the disk. Carefully ensure that they are not damaged during the season and that they are always put back after the seasonal change of wheels. When trying on disks, do not forget to check whether there are any rings left on the hub from previous disks.

Pros and cons of enlarging the center hole

What does the central hole affect, and will the technical parameters of the car change if it is enlarged? The positive aspects of a disk with a universal central diameter include:

Availability - such discs can be found everywhere. As a rule, they are produced for a large number of brands and models, so choosing the one you need will not be difficult.
Versatility - wheels with a large central hole fit many models.
Price - since such a product is produced in large quantities, the price for it is slightly lower than for “exclusively” selected discs.

But not only advantages can be encountered if you choose a disk with an increased central diameter. This choice also has some not very pleasant consequences:

At high speeds, due to the loose fit of the disc to the hub, the car begins to “beat”. Only replacing the disks can save you from this unpleasant phenomenon.
In the worst case scenario, if you select the disc incorrectly and do not install spacer rings, the threads on the wheel nuts may break off. This is an extreme option, but it still happens if you neglect safety rules.

Hub diameter for different cars

Each car has its own list of permissible wheel diameters. The parameters may change, you can usually find them out by the sticker next to the driver’s seat or from the technical characteristics of the car. The variety of diameters of the central hole sometimes confuses buyers. They sometimes differ by literally 0.1 mm. There are no uniform standards, so some manufacturers indicate data more accurately, while others less so. Some self-respecting disk manufacturers go further and indicate indicators not of 1/20 of a millimeter, but up to as much as 10 microns, i.e. up to 0.01 mm. What standards are accepted for cars of the most popular brands?

The diameter of the central hole of the VAZ disk will be 58.6 mm.
The same figure for Audi is 57.1 mm.
The diameter of the central hole of the Honda disc is 64.1 mm.
For BMW, the hub diameter ranges from 74.1 to 72.6 mm.
In Citroen cars, the indicators also vary - you can find cars with a central hole diameter of 65.1 and 58.1 mm.
Fords also have a wide range of sizes: 57.1; 63.4 and 64.1 mm.

Diameter of the central hole for Niva

Domestic Niva cars have fairly wide hubs. The diameter of the central disk hole of the Niva is approximately 98.5 mm or 3 and 7/8 inches. What car wheels can fit this car if it is not possible to buy original ones?

Niva Chevrolet;
Volga (GAZ 31024, 29), different years of production;
or Jimni.

Diameter of the central hole of Renault Logan

When choosing wheels, owners of Renault Logan cars often wonder what parameters to choose among the variety of assortments? For Renault Logan disks, the diameter of the central hole must be at least 60.1 mm. At the same time, it is better to select their radius with indicators R14 and higher. Many rims are suitable for such conditions, which greatly simplifies the task for drivers.

When purchasing rims, experts advise paying attention to the following details:

If you buy a stamped disc, be very careful when selecting parameters. Even a deviation of 0.1 mm will be critical: steel wheels do not use adapter rings, so you will not be able to ride on such wheels.
The diameter of the central hole on cast disks can be easily determined using a special plastic ring. With it you will find out the exact parameters without resorting to outside help.
If you purchase original wheels for your car, then you will not need any adapter wheels. As a rule, such a product is manufactured exactly to the parameters of the hub hole of a car of a certain brand.

A wheel rim is one of the components of a car wheel. It serves as the basis for fastening, as well as for transmitting torque from the drive shafts to it. Depending on the technology and material used, there are several types of wheel rims, each of which has both advantages and disadvantages. And the parameters of the rims, such as their diameter, width and other indicators, determine the choice in favor of one option or another.

Purpose and design of wheel rims

Car wheel design

Wheel rims, in addition to improving the appearance of the wheel, are also a necessary element for driving a car on the road. The tire itself is put on them directly. A disk with a tire on it is a car wheel mounted on a hub.

The tire is fixed on the rim by an annular ledge. The tire bead is located on a shelf that has three dimensions: standard, flat and widened. The tire is usually seated on the outer shelf. The shelf smoothly transitions into the side, which has a different profile shape.

The main purpose of the wheel rim is to ensure that the tire fits correctly and operates efficiently while driving. That is why the main requirements for a disk are strength and rigidity. Also, the disk must have a relatively small mass and geometric parameters specified by the manufacturer. This is due to the fact that wheels, as unsprung mass, influence the vehicle's driving dynamics and its handling.

Types of rims

Depending on the material of manufacture and production technology, there is the following classification of wheel rims:

stamped;
cast;
forged;
compound.

Stamped or steel wheels

They are considered the simplest and most accessible. Structurally, they are stamped steel parts welded to each other.

Pros of this type:

Acceptable price.
Relatively high strength.
Possibility of recovery even in the event of a strong blow.

The disadvantages include:

Unpretentious design.
Large mass.
Low resistance to corrosion.

Alloy wheels

Alloy wheels (sometimes called alloy wheels) are made from aluminum or magnesium alloys. These discs have high strength and good . In addition, they have a beautiful appearance. If in a steel wheel the disk itself is connected to the rim by welding, then an alloy wheel is a single product.

Alloy wheel on a car

The general advantages of alloy wheels include:

High manufacturing precision.
Various disc designs.
Ease.
They remove heat well from the brake mechanisms.

Among the disadvantages of a cast disc, one can note its relative fragility. Such a disk has a granular internal metal structure that does not resist impacts well. As you move over uneven surfaces, microcracks accumulate, as a result of which the disc may sooner or later crack. Another option is to increase the wall thickness, which will lead to weight gain. It is also expensive and difficult to restore.

In addition, this type of disc needs surface protection. Otherwise, the casting will lose its presentation.

Forged wheels

Composite disks

Further improvements in cast wheels led to the development of forged wheels or "forging". This type is produced by stamping aluminum alloys with the addition of magnesium and titanium and subsequent mechanical processing. This provides a fibrous disc structure consisting of several layers. As a result, the product is characterized by high strength, low weight and resistance to shock loads.

The main disadvantage of forging is the high price.

Combined or composite discs

This type of wheel combines "forging" strength with a "cast" design. The product is based on a cast construction with forged rims bolted on. The high cost of disks outweighs many of their advantages.

Wheel parameters

Basic parameters of wheel rims

Wheel rims are characterized by the following parameters:

rim width (distance between shelves);
disk diameter;
disc ejection;
the number of holes for fastening and the diameter of their location;
diameter of the central hole of the disk.

Rim width

The width of the rim should be 25-30% less than the width of the tire profile. The use of too wide (as well as too narrow) disks is undesirable. Due to violation of the design profile of the tire, the driving characteristics of the car deteriorate.

The permissible deviation from the norm in the distance between the shelves is 0.5-1.0 inches for disks with a diameter of up to 14 inches and 1-1.5 inches for disks with a diameter of more than 15 inches.

Disc diameter

The mounting diameter of the wheel or the size of the wheel rim for the tire is measured at the level of the shelves. There is a range of disc sizes ranging from 10 to 22 inches in diameter. The most common are its average values: from 13 to 16 inches.

Disc offset

The overhang of the disk or its protrusion is the distance from the vertical axis of symmetry of the disk to the mating plane of contact with the wheel hub.

The disc overhang can be zero or positive when the disc hub protrudes outward relative to the axis of symmetry of the disc. In the case in which the hub is recessed relative to the middle of the disk, the offset will be negative.

The amount of overhang is expressed in millimeters and is designated as ET. With positive overhang, the maximum ET value is 30 mm. In the case of a negative offset, the critical value of ET will also be 30 mm, but with a negative sign.

This indicator must comply with the vehicle manufacturer's instructions. Otherwise, the vehicle's handling may change for the worse, and the service life of suspension and transmission elements (drive shafts, hubs, etc.) may also decrease. This occurs because a change in offset entails a change in the leverage of forces and moments applied to the wheel during movement. Also, depending on the offset, it may change, which has a negative effect when braking.

Diameter of mounting holes and their number

This indicator is designated PCD. The first number in the indicator indicates the diameter of the holes, and the second – their number.

Standard diameter values are considered to be from 98 to 140 mm, and the number of holes ranges from 4 to 6.

It is very difficult to determine by eye the size of the disc and the hub. And installing a disk of the wrong diameter can cause the wheel to skew, which will lead to its “beating”.

Disc center hole diameter

The diameter of the central or mounting hole of the disk ranges from 50 to 70 mm. Accuracy in matching the disc to the hub is very important. But this applies to the standard wheels of the car. Spare parts manufacturers often make a hole with a slightly larger diameter, and offer a set of adapter rings complete with the disc. In this case, the wheels will be centered on the PCD.

Decoding disk markings

Disc markings

The marking of the disk characterizes its size. It is usually applied to the inside of the hub of a cast disk. Let's imagine the designation of each of the indicators with the following example: 5.0×16″ 4×113 ET28 d58.4, Where

5.0 – rim width in inches;
16″ – disk diameter in inches;
4×113 – number of mounting holes and their diameter;
ET28 – disc offset;
d58.4 – diameter of the central hole.

Conclusion

When choosing rims, it is necessary to take into account both their technical characteristics (such as diameter, rim width and other indicators), as well as the quality and origin of the rims themselves. Otherwise, the purchase depends on the preferences of the car enthusiast and his willingness to part with a certain amount when purchasing wheels.

If you haven't found the data for your car, you can measure it yourself. To choose the right disk, you need to know six basic disk parameters:

But in order to measure not all parameters, some of them can be read in the operating instructions for your car or on the spare wheel, if the car is equipped with a cast (aluminum alloy) full-size spare wheel (the same as all the other wheels that are on the car ).

To do this, you need to remove the wheel from the trunk and read the inscriptions on the inside of the disk.

If your car is equipped with a tire, then you need to remove one wheel from the car if it has alloy wheels.

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