Wheel discs have many parameters - not only the diameter and number of holes for bolts. But mostly motorists pay attention to these two characteristics. When you choose a product, be sure to specify the required parameters of car wheels, provided by the manufacturer of your vehicle.
It is important to be aware, that any non-compliance with the factory requirements has a negative impact on the operation of the suspension. It, in turn, helps to accelerate the wear of the tire and various parts of the chassis. There is a possibility, that your wheel will come off while driving, which can lead to deplorable consequences. For this reason, the installation of such products must be accompanied by their further control during operation.
Example of decoding
Usually, the usual description of car wheels looks like this:
6,5jx155/112H2ET45d57,1.
so, what do these letters and numbers mean?
Marking of wheel disks
- 6,5 - the width of the disc rim fit, is indicated in inches. It is calculated as follows: 6,5*25,4= 165.1 mm. This value is directly related to the width of the tires. Each tire has a permissible disc width. This value of the component is known by calculations, based on the size of the tire. If the size of the two elements do not match, you will have problems with tire beading.
- Letter J, as well as D, P, K, JJ and others, encrypts technical data on the edges of the car disc rim (its height, shape and structure). The most popular types of disc rims today are J (for a car with a single drive) and JJ (for all-wheel drive vehicles). Foreigners directly affect the installation of rubber and size, on which the tire is shifted in some situations.
- Under the label 5/112 hidden properties of disk mounting to the hub. Number 5 If there is a number, how many holes for fastening bolts should be on the product, and the number 112 - the diameter of the circle, where the centers of these openings should be located. Sometimes component manufacturers apply this parameter separately and label it with the letters PCD or Pitch Circle Diameter.
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- The letter H in the description of wheel disks speaks about features of shelves of a disk rim, as well as speeches, which they have. These protrusions are required for tires without cameras. They ensure the correct installation of the tire and disc.
- The symbol ET45 in the parameters of car wheels means the departure of the disk in millimeters. What is the departure of the wheel disk is the distance between the central disk axis, as well as the plane of application of the disk. It must meet the production requirements of your car with maximum accuracy, as is one of the key to establishing the characteristics of the suspension and steering mechanism. One hub has one outlet for any size and type of tire. Some manufacturers also label this data separately with the words OFFSET or DEPORT.
- d 57,1 (DAY) - diameter of the hole, located in the center of the disk. It must fit the size of the cylinder, located on the hub. In addition to the centering function, the cylinder takes the load, going on pins. If the center hole of the desired product exceeds the dimensions of the cylinder, you will need to use centering rings. They can be purchased at tire centers.
Alloy wheels
Specifics
The characteristics of alloy wheels also assume that they have a maximum load level. For this reason, even in the case of external coincidence of the size of the alloy wheels with the parameters of your car load for them from the manufacturer to clarify. There are two options, How to do it:
- if the wheels are from Russian manufacturers, then this figure is in the passport of the disk;
- if from abroad - you will need to find this information on the site. Usually, data on the guaranteed use of cast components on a car is available from each manufacturer in a special catalog. If you found your car in the catalog and looked at the appropriate product for it, you can buy it without fear.
It happens, that the dimensions of the cast product completely match the required. However, it cannot be installed on a car. During installation, the disc begins to rest on the suspension or brake mechanism. This situation is due to the form of stamping or casting needles. For this reason, always try the disc on the front and rear car axles before carrying out the tire beading procedure, pre-tightening it with at least two bolts.
Alloy wheels on the car
As for PCD, it usually cannot be changed, though, that many manufacturers provide special bolts with eccentrics. They allow you to install, example, PCD products, 100 mm, on a car with PCD, 98 mm. So remember, that the difference between the PCD of the product you need and the car data should not exceed 2,4 mm (eccentric nuts, which are mounted on cast models, can be shifted by a maximum of 1,2 mm).
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