Wheel goes eight: causes, diagnosis and methods of editing

The situation when wheel goes eightIt is familiar to many motorists, especially those who often face poor quality of the road surface. This phenomenon is a deformation of the wheel disc, in which its plane ceases to be perfectly flat, causing a beat when rotating. Visually, this can be invisible on a stationary car, but at speed leads to strong vibration of the steering wheel, uneven wear of rubber and discomfort in the cabin. Ignoring the problem can cause failure of suspension elements and even an emergency situation on the road.

Most often deformities are subject to die-plate because of the lower strength of steel compared to cast analogues, however, aluminum alloys are not immune to damage during strong impacts. The concept of "eight" describes exactly the side beat, when part of the disk stands to the side, violating the geometry of rotation. Beating more than 1.5 mm is considered critical.It already has a significant impact on the handling and safety of the vehicle. It is important to identify the defect in a timely manner and choose the right method of recovery.

In this article, we will discuss in detail how to independently diagnose curvature, what are the ways of editing in the garage and service station, as well as when repair becomes economically inexpedient. You will learn about the differences in the repair of steel and alloy wheels, as well as how to avoid common mistakes that can finally spoil the part. The right approach to solving the problem will prolong the life of your wheels and ensure a comfortable ride.

The main causes of disk deformation

The main enemy of the geometry of the wheel disc is mechanical shocks. Getting into deep pits at high speed creates a huge load on the rim. The metal or alloy cannot withstand instantaneous compression between the hard edge of the pit and the tire, resulting in local deformation. If the impact fell on the side, a dent is formed, if the impact was tangential or complex, the disk can "lead", and the same eight will appear.

Another common reason is overloading of the car. When the wheels are weighing more than the calculated weight (for example, when carrying a heavy load or towing a trailer), the strength of the metal decreases, especially if it already has microcracks from previous impacts. In combination with heating from braking or long driving, the material becomes more plastic and changes shape more easily under the influence of centrifugal forces and road irregularities.

It is also worth considering the factor of corrosion and fatigue of the metal. In time. die-plate They are rusting, especially in places where paint is chipped. Rust eats away at the metal, making it thinner and weaker. In such areas, even a small impact can cause significant curvature. Cast discs are susceptible to metal fatigue and can crack, which visually can also be perceived as a violation of geometry, although repairing cracks requires welding.

⚠️ Attention: If after a strong impact you feel the beating of the steering wheel, do not delay with the diagnosis. Riding with a severely deformed disc can lead to depressurization of the wheel at speed or damage to the hub bearing.

Often drivers forget about the quality of the installation. Incorrect installation of the wheel on the hub, the presence of dirt or rust on the landing plane can create the illusion of eight or aggravate the existing problem. Bolts, twisted with different forces or not according to the scheme (cross-cross), also contribute to the swaying of the disk during puffing.

Symptoms and methods of self-diagnosis

Determine that the wheel goes eight, you can by characteristic signs during movement. The first and most obvious symptom is the beating of the steering wheel. If vibration is felt on the steering wheel, the front wheel is likely to be deformed. If the entire body of the car is shaking, especially in the rear seats, the problem is probably in the rear wheels. The intensity of vibration usually increases in proportion to the speed.

The second sign is uneven wear of the tire tread. If you look closely, you can see that the rubber wears off stains or on one side faster than on the other. This is a direct consequence of the fact that the wheel when rotating "jumps" or touches the road at the wrong angle. There may also be a hum or knock in the area of the wheel arches, which varies depending on the speed of rotation.

For visual diagnostics in garage conditions, there is a simple but effective method. It is necessary to dock the car so that the wheel rotates freely. Take chalk or marker and place your hand against a fixed suspension element (such as a lever or shock absorber rack) by pressing the tip of the writing instrument against the edge of the disc. As you slowly rotate the wheel, you will see where the disk is closer to the tag and where it is removed.

• 🔍 Rotational method: Turn the wheel with your hand and watch the gap between the disc and the brake caliper.
• 📏 Use of the ruler: Fix a ruler or flat bar next to the disk and measure the distance to the rim edge at different points.
• 👀 Visual examination: Look for obvious dents, paint clutters or traces of blows on curbs.
• 🚗 Test on the ground: Place a long flat rack across the wheel lying on the ground and spin it, watching for gaps.

More accurate diagnosis is carried out on specialized balancing machines. The wizard spins the wheel, and the sensors detect not only the mass imbalance (which is eliminated by the loaders), but also the geometric beat. The screen displays values in millimeters, which allows you to accurately determine the degree of deformation and the possibility of its correction.

Technology of editing stamped disks

Recovery stamped - the most common procedure, since steel has good ductility and is amenable to mechanical action. The process of editing is to return the metal to its original shape. In professional conditions, a hydraulic machine is used to do this, which creates a force of several tons, squeezing out a dent or aligning the plane of the disk.

There are two main types of editing: cold and hot. Cold editing is used for small deformations. The disc is fixed on the machine, and the hydraulic punch gently squeezes out the damaged area. Hot editing is necessary when the metal is heavily strained or the deformation is difficult. In this case, the bending place is heated with a gas burner to a reddish hue, which makes the metal softer, and only then rule. This allows you to remove the internal stress of the metal.

At home, if there is no machine at hand, you can try to align the disk with a sledgehammer. This method requires skill: the disc is placed dented upwards on a hard surface (for example, on a rail or concrete) and applied neat blows, trying not to damage the shelf of the disk. However, this method rarely achieves perfect geometry and is often used as a temporary solution.

⚠️ Attention: When editing stamped disks, it is important not to overdo it with effort. Excessive extrusion can lead to thinning of the metal and cracks, which will make the wheel dangerous to operate.

After mechanical editing, it is necessary to paint the restored areas. Even if the paint has been only slightly damaged, it often flakes off at the sites of deformation. Left unprotected metal quickly covered with rust, which will continue to destroy the disk from the inside. Special soils for rust and enamel for discs are used.

Features of recovery of cast disks

Repairs alloy-disc (Cast and forged) technologically more difficult and not always possible. Aluminum alloys, unlike steel, are less plastic and more brittle. They do not break, but they break or break. If cracks are visible on the disk, especially passing through spokes or near bolt holes, editing can be ineffective or dangerous.

The process of reclamation of cast discs often involves argon welding. Before editing, all cracks are brewed with a special filler material corresponding to the composition of the alloy. Only after sealing of damages the disc is subjected to heating and editing on the hydraulic press. Heating is mandatory here, since cold aluminum will simply burst when trying to edit.

It is important to understand the difference between cast and forged discs. Forged discs have high strength and elasticity. If the forged disc is dented, it can often be straightened without welding, as it does not crack as easily as cast. However, the cost of forged discs is high, and their repair requires a high qualification of the master, so as not to disturb the structure of the metal.

Can I cook alloy wheels with ordinary welding?

No, conventional electric welding or semi-automatic for cast discs are not suitable. Aluminum requires welding in an inert gas (argon) environment using special additives. Violation of the technology will lead to the porosity of the seam and the destruction of the disk during operation.

After editing and welding, cast disks must undergo the painting procedure. Powder painting technology is often used, which provides a durable and durable coating that protects against reagents and stones. During the painting process, the disc is also grinded and degreased.

Balancing and Final Check

Any editing of the disc, whether it is cold rolling or hot recovery, disrupts its mass distribution. Even if the geometry is restored perfectly, the disc becomes heavier at the editing site or loses metal mass when grinding. The mandatory stage after the repair is balancing.

On the balancing machine, the wheel spins, and the computer shows where and how much weight to add to the center of gravity coincides with the axis of rotation. The trucks are glued to the inner or outer shelf of the disk. If the beating remains after the editing (even within acceptable limits), the wizard may try to shift the loads so as to compensate for the residual vibration, although this is not always effective.

The final check includes the wheel installation on the car and a test ride. It is important to make sure that the vibration has disappeared not only at a certain speed, but also throughout the entire speed range. Also check the tightness of the connection of the disc and the bus, especially if the editing affected the sides.

Type of disk	Method of editing	Difficulty	Probability of success
Stamped	Cold/hot rolling	Low.	High (90-95%)
Cast (aluminum)	Heat + editing + welding	Tall.	Medium (60-70%)
Forged	Heat + editing	Medium	High (in the absence of cracks)
Composite (multiple-clove)	Disassembly + editing of the shelf	Very high.	Depends on the damage.

When a disk repair is not possible or feasible

Not all disks are recoverable. There are critical injuries in which the operation of the wheel becomes deadly. First of all, these are deep cracks in the places where the spokes are attached to the rim or around the holes under the bolts. These zones experience maximum load, and any crack here can cause the wheel to collapse on the go.

Also, discs with severe corrosion are not subject to correction, when the metal has turned into a loose mass. If, when trying to edit the disk begins to crumble or crack in new places, its further restoration is meaningless. The cost of work and painting in this case may exceed the price of a new disc, especially if we are talking about budget models.

Another case when it is better to refuse repairs is a violation of the geometry of the landfill plane. If the disc is curved around the hub, no balancing will help. The beat will persist, and the load on the hub bearing will increase many times, which will lead to its rapid failure. You can check this by attaching a ruler to the landfill plane.

⚠️ Attention: Never use sealants to seal cracks in cast discs. This is a temporary measure that will not withstand the load on the road and can lead to a sudden loss of pressure in the wheel at high speed.

In some cases, it’s easier and cheaper to buy a new disc than to try and save an old one. This is especially true for rare or expensive models, where quality repair is very expensive. Always weigh the risks: the safety of the driver and passengers cannot be measured in monetary terms.

Prevention and care of wheels

To avoid the situation where wheel goes eightThe rules of operation must be followed. The main advice is to avoid getting into pits and hitting curbs. If it is impossible to avoid an obstacle, drop the speed to a minimum before impact. This will reduce the force of the impact on the disk and suspension.

Check the wheels regularly for damage. Small chips of paint should be painted with a special pencil or enamel immediately to prevent corrosion. Clean disks are also important: aggressive reagents, which are sprinkled on roads in winter, quickly destroy the lacquer coating and metal.

When seasonally replacing tires, pay attention to the condition of the discs. Ask the tire wiring masters to carefully inspect the geometry and, if necessary, immediately send the disk for editing until the deformation becomes critical. Proper storage of the wheels in the off-season (whether assembled with rubber or separately) also prolongs their life.

• 🚿 Wash: Wash your disks regularly, washing away dirt and reagents, especially after a winter drive.
• 🛡️ Defense: Use protective compounds (waxes, polishes) to create a barrier between the metal and the environment.
• 🔧 Puff: Check the tightening of the bolts after the first 100 km of run after the wheels are installed.
• 🅿️ Parking: Try to park carefully, without touching the curbs of the sidewall tire and the disc.

Following these simple guidelines will allow your drives to last a long time and maintain perfect geometry. Remember that wheels are the only element of your vehicle’s contact with the road, and their condition directly affects your safety.

Can I drive if the wheel is a little bit heavy?

You can only drive with a beat to the nearest diagnostic service. Long-term operation will lead to suspension breaking, rubber wear and discomfort. Beating is a constant impact load on the car’s nodes.

Is it true that cast discs cannot be manipulated?

It's a myth. Cast discs can be manipulated, but the technology is more difficult than for stamping. Heat is required and welding is often required. However, in case of severe damage (spoke cracks), editing may be impossible or impractical.

How much does it cost to edit the disc?

The cost depends on the type of disk and the degree of damage. Editing a stamped disk is usually cheaper (conditionally 10-20 USD), cast - more expensive (30-50 USD). above), especially if welding and painting are required. Prices vary depending on the region and service.

How to distinguish the beat of the disc from the beat of the brake disc?

The wheel beats at any speed and is often accompanied by a hum. The beat of the brake disc is manifested mainly during braking (shocking of the pedal or steering wheel). Diagnosis on the lift will help to accurately determine the source of vibration.