Basic parameters of disks

Many motorists, when they come to stores that sell car wheels, the question arises as to which tires and disks to choose. To make the right decision, you need to know a lot, including the parameters of the disks. On the same car you can install wheels with different parameters, but some expand the track, going beyond the wheel arches, and others - narrow down.

Speaking about the parameters of the discs, it is necessary to mention the first thing about the outreach of the wheel. This is the distance between the plane of the disk attachment and the vertical plane of the wheel symmetry. It is considered positive, if the imaginary plane does not go through the land lot. Negative - if on the contrary, it passes through it.

If we talk about the parameters of the disks, then the outreach of the wheel is perhaps the most important. To determine how large it is, you should measure the B-dimension from the inside of the wheel, as well as the width of the rim of the D-wheel. Then you need to divide the D-size into two and subtract the value from the B-size. If the difference is positive, then the departure is also appropriate. Negative - the flight is the same, respectively.

A positive flight indicates how much the plane of the wheel rims "out" outside the imaginary plane that passes through the middle of the rim. In this case, the wheel is displaced towards the longitudinal axis of the machine inside. In a word, the track is narrowed. It is worth noting that the parameters of VAZ disks, for example, differ in their outreach, which ranges from 23 to 40.

The central hole should have a diameter corresponding to the diameter of the seating cylinder, which is located on the hub of the machine. It is necessary to accurately interface these dimensions to ensure the centering of the (preliminary) wheel on the hub. This facilitates the process of installing the bolts. The final centering takes place on conical surfaces.

The next thing to be mentioned when discussing the parameters of the discs is the diameter of the mounting holes. This is the diameter of the circle, which is formed by holes, designed for attachment to the wheel hub. For different machines there are different diameters and number of holes.

It should be noted, speaking about the parameters of car disks, that the wheel should be checked on the vehicle even before it is assembled with the tire. You need to make sure that it fits snugly against the surfaces, does not stand behind the body and rotates freely.

Before you buy a disc, you need to check the diameter and number of mounting holes, and another step, the diameter and thread length of the bolts (remember that the length should not be less than eight full turns, seven permissible). Since the fastening holes are made with a positive tolerance that touches the diameter, it can easily be mistaken in its choice. In this case, only one of the nuts will be fully tightened. The rest will be displaced, as a result of which the fasteners will be tightened with a skew or not enough. Because of this as a consequence - incomplete landing on the hub. The wheel on the move will vibrate, and not tightened nuts can unscrew at some point.