Car rim parameters.

Car rim parameters.

Wheel rims have many parameters – not just the diameter and the number of bolt holes. But basically, motorists pay attention to these two characteristics. When you choose a product, be sure to specify the necessary parameters of rims provided by the manufacturer of your vehicle.

It is important to be aware that any non-compliance with the manufacturer’s requirements will have a negative effect on the functioning of the suspension. This, in turn, contributes to accelerated wear on the tire and various parts of the undercarriage. There is a possibility that a wheel will come off while driving, which can lead to disastrous consequences. For this reason, the installation of such products must be accompanied by their further control during operation.

An example of decryption.

As a rule, the usual characteristic of car disks looks like this:

6.5jx155 / 112H2ET45d57.1.

So what do these letters and numbers mean?

6.5 – the width of the disc rim fit, 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 component value is determined by calculations based on the tire size. If the dimensions of the two elements do not match, you will have problems with the tire bead. The letter J, like D, P, K, JJ and others, encrypts technical data about the edges of an automobile disc rim (its height, shape and structure). The most popular types of disc rims today are J (for cars with mono drive) and JJ (for all-wheel drive cars). Flanges directly affect the fit of the rubber and the amount by which the tire moves in some situations. Under the designation 5/112, the properties of mounting the disc to the hub are hidden. The number 5 indicates how many holes for fastening the bolts should be on the product, and the number 112 indicates the diameter of the circle where the centers of these holes should be located. Sometimes component manufacturers apply this parameter separately and mark it with the letters PCD or Pitch Circle Diameter.

The letter H in the characteristics of the rims speaks about the features of the disc rim shelves, as well as the protrusions that they have. These tabs are required for non-tube tires. They ensure the correct mounting of the tire and rim. The ET45 symbol in the parameters of rims indicates the offset of the rim in millimeters. What is a wheel rim departure


The characteristics of alloy wheels also provide for their maximum load level. For this reason, even in the case of an external coincidence of the sizes of alloy wheels with the parameters of your car, the load for them from the manufacturer must be clarified. There are two options for how to do this:

if the wheels are from Russian manufacturers, then this indicator is in the disk’s passport; if from foreign – you will need to find this information on their website. As a rule, each manufacturer has data on the guaranteed use of cast components on a particular car in a special catalog. If you found your car in the catalog and looked at the appropriate product for it, you can safely purchase it.

It happens that the dimensions of the cast product completely coincide with the required ones. However, at the same time, it cannot be installed on a car. During installation, the disc begins to abut against the suspension or brake mechanism. This situation is due to the shape of the stamping or casting spokes. For this reason, before carrying out the tire bead procedure, you must always try on the disc on the front and rear car axles, having previously screwed it on at least two bolts.

As for the PCD, it usually cannot be changed, although many manufacturers provide special cam bolts. They allow you to install, for example, products with PCD, 100 Bluetooth Earphones-manual.pdf mm, on cars with PCD, 98 mm. So remember that the difference between the PCD of the product you need and the data of the car should not exceed 2.4 mm (eccentric nuts, which are mounted on cast models, can be displaced by a maximum of 1.2

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