For most people who are not familiar with the device of the car, the phrase “wheel outburst” probably seems to be something related to emergency situations on the road. However, it is not. Wheel rim is an important geometric parameter on which the choice of car rims is based.
Outreach - the distance between the plane of the wheel when mounted on the hub and the vertical plane of symmetry. This value is measured in millimeters and can be either zero or positive or negative. If the middle of the wheel is located slightly behind the so-called mating plane, then the offset is considered positive. If the middle of the wheel is in front of the plane, then they speak of a negative overhang. In that case, if the plane coincides with the middle, then the departure on the disks is zero. A positive outreach can be visually recognized by a slightly “recessed” wheel in the wheel arch. With a negative outreach, the wheel disc seems to “bulge” out.
Departure of a disk, as well as many other technical characteristics of automobile wheels, is strictly an individual parameter for each car. If this value is not respected, the installed disks can touch the car body, which will lead to significant premature wear. There is a rule among the people that the likelihood of success is much higher if a disk is mounted that has a slightly smaller outreach, while mounting a long-reach disc is not always successful.
Sometimes there may be some problems with installing drives with a smaller overhang. However, this is easily solved by the additional installation of spacers for shock absorbers, which slightly raises the rear clearance. In addition, fluctuations in the values of the ejection of the disk within ± 5 mm from the standard value are considered quite acceptable.
If you nevertheless installed discs with a departure value that is not standard for your vehicle, it must be borne in mind that the distance from the bearing to the fulcrum on the ground also changed. And the larger this value, the greater the load will be on the bearing. This is due to the fact that the resulting torque will create a load that will exceed the nominal.
If you have chosen rather narrow disks, then it should be noted that the outreach of the disk should be slightly larger than the standard one. And vice versa: wide wheels - smaller overhang. In the event that you are at a loss to choose suitable disks, it is necessary to address qualified specialists.
Installation of improperly selected disks can lead to negative changes in the car's handling on the road and reduce ride comfort, rapid wear of the suspension elements, as well as a change in their characteristics (radius of rotation of the wheel, travel, running shoulder). In addition, the steering behavior will change, the gauge and fuel consumption will change, which, ultimately, will lead to a reduction in the life of the car. Care should be taken not only about the appearance of the car, but also about the safety of passengers inside it.