About the central hole of the disk. What is the diameter of the center hole of a car wheel? Hub diameter for different cars

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.

Reading time: 11 minutes.

In order to choose the right wheels for a car, you need to know about such things as: types of disks, disk diameter, disk mounting diameter (dia), rim width, wheel offset, HUMP, PCD, maximum load that the disk can withstand. Knowing all these aspects, you can easily choose the drives that suit you best.

Types of disks

Car wheels can be classified into three main types, or categories: stamped, cast and forged. Of course, you can write a separate entire material about each specific type, but here we will look at the main nuances and differences.

Stamped discs

The first type of discs is stamped. They are the cheapest and, perhaps, the most common: after all, these are the same rims that we are used to seeing on stock and even mid-range trim levels of many budget cars, both domestic and foreign. And sometimes even the cheapest and most basic versions of class D and E cars. The same ones that are often covered with decorative plastic caps. They are made of steel and painted with enamel. They have their own advantages, and among their advantages, in addition to the lowest cost, is that they can be easily and quickly restored; they are also distinguished by their high maintainability, among other types of disks. The secret lies in the fact that “stampings,” as they are popularly called, do not break when struck or severely damaged, but crumple, and as a result, due to their origin, they are easy to repair, because they are a whole stamped piece of metal. But there are also disadvantages - the other side of the coin, again, due to the features. So, the main disadvantage of these wheels is their high weight and design, or rather the lack of the latter: after all, for manufacturers they are only a purely functional product.

Alloy wheels

The second type is alloy wheels. As statistics show, although they sometimes lag behind their stamped counterparts in popularity, they almost always constitute worthy competition. A different manufacturing technology is used here. For the manufacture of such disks, not steel is used, but a lighter alloy, usually aluminum. Unlike “stamps”, due to the introduction of manufacturing technologies, engineers and manufacturers have a lot of room for imagination: alloy wheels can have a wide variety of shapes. And not only this - combined with a lighter weight than stamping, this guarantees their popularity. The cast disc has a grainy internal metal structure.

“Casting” also has some disadvantages: these include their higher cost than “stamping”. As well as their lower maintainability. The fact is that, due to their origin, alloy wheels do not wrinkle after strong impacts or when damaged, like “stamps,” but crack. Although it is worth noting that special technology for welding restoration and rolling has been used for several decades, even so it is impossible to completely guarantee the restoration of the original qualities and properties and their preservation after such repairs.

Forged wheels

And the third common type are forged wheels. This type is the highest quality and most expensive option of all of the above. In their production, hot die forging is used, and thanks to this method, the best internal structure of the metal is guaranteed and, from which it follows, a combination of the highest strength with the lowest weight of the disk. It should be noted that the downside of this method is that the products are not so widespread and the cost is high. They are known among lovers of expensive, high-quality wheels (usually for the same cars) and lovers of tuned cars.

In addition to all the above types, there is also a so-called prefabricated disk. However, this is already exotic; they are made using special technologies from ultra-light and ultra-strong metals (which means they are ultra-expensive), and even other materials, say, composites, and we will not consider them here. As a rule, the average car owner opts for either inexpensive, but visually boring “stampings”, or at least more expensive, but much more pleasant-looking alloy wheels.

Disc diameter

In two words, this parameter of the disk is obvious (visual): in other words, it is its circumference, which is commonly counted throughout the world in inches. It is usually denoted by the letter R: for example, the R14 and R18 disks have a diameter of 14 and 18 inches, respectively.

Particular attention should be paid to the fact that the letter R itself has nothing to do with the diameter, and comes from the designation of the properties and parameters of the tire, where it is also common to mistakenly use the word “radius” in the designation. However, in reality, this only implies the tire diameter.

In fact, in the case of tires, it is customary to designate the marking using R - due to the type of cord construction. Meaning radial, the concept is a relic of the past. Once upon a time, in addition to radial tires, there were also diagonal tires, and for a wheel the use of this marking is practically no longer relevant. As a result, such an erroneous use of the word “radius” in the designation “diameter” with the accompanying letter R is so deeply rooted in speech that not only car owners, but also many sellers and servicemen, and disc service stations use it by default.

What possible diameters exist for wheels for a specific car model, which are acceptable, can be found in their operating manuals. This is also evidenced by the stickers that are located in the doorways, which, in addition, contain data on the recommended tire pressure. When you are going to buy disks, you should know that their diameter must necessarily coincide with the mounting diameter.

You should not go too far with the maximum permissible disc diameter declared by the manufacturer. Unless, of course, you are involved in complex tuning of cars, especially suspensions. The fact is that discs that have too large a diameter have a negative effect on the chassis. Because of this, the parameters of the suspension and its usual operating conditions change. The load also increases not only on the suspension parts, but also on its attachment points with the body, and the wear of the chassis accelerates. Also, they often have geometric incompatibility. Even if everything is correctly selected and configured, especially after proper tuning of the car, you should know that the larger the diameter and width of the disk, and especially the lower the profile of the rubber, the greater the degree of discomfort when driving on bad roads. And even on uneven or rocky road surfaces. Also, another problem is that you have to slow down a lot in front of speed bumps and, especially when crossing tram tracks. Or you should take into account the nuances of tuning on the contrary - that is, when the diameter of the disks has not increased much (although it may have increased), but the rubber has a high profile. That is, unlike the previous option, there are some advantages here - bolder and faster crossing of the same tram tracks and speed bumps and other obstacles, and confident movement off-road, and a more comfortable and noble “gait” on bad roads.

What will happen if you don’t tune the suspension, no matter a crossover, a car, or even a real “rogue”? Similar problems listed above will appear related to the chassis, which are also relevant here. Also, low-profile tires guarantee more precise and composed behavior, confident cornering at high speeds, and good grip at high speeds on the highway. But with high-profile wheels, it’s just the opposite – with them the center of gravity often increases, and reactions to the steering wheel are more blurred and delayed, and at high speeds stability is inferior even to stock wheels.

True, it is worth knowing that if you change the diameter of the disks within the recommended permissible value, as indicated in the manual, an inch more, then everything for the chassis and body will take place with virtually no significant consequences.

DIA

Another important parameter is DIA, which is the diameter of the central hole. More precisely, the diameter of the central hole for the hub.

Rim width

Now let’s look at another important parameter, with which, by the way, everything turns out to be as simple as with the letter “R”, as mentioned earlier. The width of the rims is usually calculated in the same way - in inches. How nice, they designate it with the letter J. For example, 6J, or 7.5J: that is, we have a disk with a width of six or seven and a half inches, respectively.

As a rule, the disk width data can be seen in the same special places where its permissible mounting diameter is written. In addition to the geometric parameters for the car, it is important to take into account the width of the rim when choosing tires: they are produced taking into account operation with a rim of a certain width. However, some error is allowed. Let's say that many Russian cars have a factory width of 175 mm, but without special measures and tuning, 185 mm is allowed.

Disc offset (ET)

In short, the offset is the distance, the interval from the mating plane of the disks to the hub to the longitudinal axis of symmetry. To put it simply: the central axis of symmetry is the line that bisects the disk along the aforementioned width. The point where the disk hub comes into contact with it and is screwed to it is called the mating plane.

There are three types of departure: positive, zero and negative. So, in the case when the axis of symmetry is closer to the car, in relation to the mating plane, this is considered a positive offset. If they are on the same axis, then this is considered zero. And the third type - if the axis of symmetry is located further away from the car, compared to the mating plane - then the camber is considered positive. In two words, based on the greater the overhang of the disk, the deeper it should sit in the wheel arch. And vice versa - if it is smaller, then based on its size, the disk should protrude outward.

It’s worth considering that offset is one of the rather important parameters. Because it also directly determines how the entire suspension, wheel bearings and their supports, and the attachment point work. If the offset is non-standard (due to the installation of other disks), then this will only increase or decrease the car’s track, which will have an ambiguous effect on handling, and even worsen it, but can also guarantee accelerated wear of the entire chassis and bearings.

HUMP

The concept of HUMP, also known as (H), is also known among us as hump. This is the name given to the ring-shaped ridges on the rim. Thanks to the humps, the tubeless tire does not jump off the rim - this is prevented. Typically, a pair of humps (designated H2) is installed on the wheel. However, there is also a single type (simply - N). In some cases, they may simply not exist at all. Humps belong to one of the following types; flat, asymmetric () and combined. Their designation is FH (from the English word Flat), AN (Asymmetris), and CH (Combi), respectively.

Nowadays, you can only find tube tires that do not have humps on rare cars with retro wheels of considerable age. Although it is possible to install tubeless tires on them. True, the question of the safety of the car when driving and its sealed fit remains open: after all, when cornering there is a very high risk of “taking off your shoes”, since there is insufficient pressure inside the tire.

Also worth noting is ET: this is how the disk is offset. If the offset is smaller, then based on its value, the more the discs will protrude from the outside of the car. Therefore, the more important the offset is, the deeper the disc will be “recessed” into the car body.

Mounting Hole Diameter (PCD)

Holes are used to attach disks; in other words, this is PCD. It is also known as "bolt pattern", which refers to the diameter of the circle and the number of holes. They are installed on it. This is an abbreviation for the English concept Pitch Circle Diameter and refers to the diameter of a circle. The number of mounting bolts varies, and their number increases based on the increase in the weight of the car model and its maximum speed. As a rule, there are from four to six. However, there are more of them (for example, seven and eight) and fewer (but not less than three). For example, almost the entire modern model range of AvtoVAZ “stands” on the bolt pattern with a value of 4x98-4x100, except for models such as Oka (where 3x98 is used) and the Niva version (where 5x139.7).

It is necessary to comply with the required disc bolt pattern: although it seems that some discs - for example, 4x100 with 4x98, they are interchangeable, this is not so. It would seem that the difference in the diameter of the circle is only a small couple of millimeters. However, in reality they have a very strong influence, or rather interfere with installation. The fact is that only one of the four fasteners will be able to be tightened correctly, and the rest will be offset from the center. And this can cause the wheels to wobble. This problem is partly solved by the use of bolts called “floating cone”, but in general the use of discs with inappropriate and unintended bolt patterns should be avoided.

Maximum load that the disk can withstand

This is the static load capacity, measured in kilograms or pounds. Let's say 555 kg per cast disc, this means that four discs are designed to handle a maximum weight of 2,220 kg. If the weight exceeds this norm, then it will be difficult for the discs. Each index value has a maximum load in kg, or pounds, that the tires can withstand in everyday use.

Let's look at the disc markings

For example, let’s look at the marking 9.5×20 5×120 ET 45 Dia 72.6

1. 20 is the mounting diameter of the disk, measured in inches;
2. 9.5 - disk width, measured in inches;
3. 5 - number of holes, measured in pieces;
4. 72.6 - hub diameter (DIA), measured in millimeters;
5. 120 - bolt-to-bolt distance (PCD), measured in millimeters;
6. 45 - disc offset (ET), measured in millimeters.

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.

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.