Figure-8 wheel: how to recognize what is dangerous and how to eliminate disc deformation

What is the “eight” on the wheel and how to spot it?

If, when driving at speeds above 60 km/h, the steering wheel begins to “beat” and the car wobbles slightly to the sides, most likely, a problem has formed on one or more wheels. eight. This is a deformation of the disc in which its rim loses its perfectly round shape and takes on the shape of the number “8”. Even a slight curvature of 1-2 mm can cause vibrations that are transmitted to the steering wheel and body.

The main problem is that eight not always noticeable to the naked eye. For example, on cast wheels with wide spokes, the curvature can be missed, but on stamped wheels it can only be detected when the wheel rotates. To check the disc, just jack up the car, spin the wheel and visually evaluate how it rotates relative to a fixed point (for example, a caliper). If the rim “walks” up and down or left and right, this is a sure sign radial or lateral runout.

It is important to distinguish the eight from other problems:

• 🔧 Wheel imbalance — vibration appears at a certain speed (usually 90–110 km/h) and disappears during acceleration/braking.
• 🚗 Suspension wear — knocks and vibrations intensify on uneven roads, and not on a smooth road.
• 🔄 Deformed tire — “hernia” on the sidewall or uneven tread wear.

If the beating is felt constantly and intensifies with increasing speed, with a 90% probability it is the eight that is to blame.

Reasons for the appearance of figure eight: from pits to improper installation

The most common reason is hitting obstacles. It is enough to hit the wheel into a deep hole, curb or rails at a speed of 40+ km/h for the disc to become deformed. At the same time alloy wheels they break more often than stamped ones: they are stiffer and do not bend, but crack. The stamping “swallows” the blow, but crumples, forming a figure eight.

Other common reasons:

• 🛠️ Incorrect tire installation — if a hammer was used during trimming or the disc was clamped in a vice.
• ❄️ Sudden temperature changes - for example, after washing with hot water in cold weather.
• 🔧 Loose mounting bolts - the wheel “walks” and hits the hub.
• 🚛 Vehicle overload - especially relevant for minibuses and pickups.

Interestingly, the number eight can appear even after long drives on dirt roads: small stones and sand act as an abrasive, gradually abrading the metal at the attachment points.

There are also factory defects - the disc initially has an uneven rim thickness. You can check this by measuring it micrometer at several points. The permissible difference for new disks is no more than 0.15 mm. If it’s more, it’s a defect, and it’s better to return such a disk under warranty.

How to distinguish an eight from an imbalance?

When unbalanced, vibration usually appears at a specific speed (for example, 90–100 km/h) and disappears during acceleration or braking. The figure eight gives a constant beat, which increases in proportion to the speed. Also, the imbalance is more often felt on the steering wheel, and the figure eight is felt throughout the body.

What are the dangers of driving with a figure eight: consequences for the car

Ignoring the figure eight on the wheel leads to accelerated wear of the suspension 30–50% faster than normal. Vibrations are transmitted to wheel bearings, shock absorbers and steering rods, reducing their service life. For example, a bearing that should last 100,000 km may fail after 50,000 km.

Other risks:

• 🔥 Overheating of the brake system — the disc rubs against the pads, increasing the braking distance.
• 🛞 Uneven tire wear — the tread wears off in spots, which leads to aquaplaning.
• 🚨 Loss of control — at high speed, the beating can cause the car to spontaneously pull to the side.

It is especially dangerous to drive with a figure eight all-wheel drive cars (for example, Subaru Forester or Toyota RAV4): vibrations are transmitted to the transfer case and can damage the differential.

The economic damage is also significant. For example, replacing a wheel bearing with Volkswagen Passat B6 will cost 8–12 thousand rubles, and a pair of new tires will cost from 15 thousand rubles. For comparison, editing a disc in the service costs 1.5–3 thousand rubles.

⚠️ Attention: If the figure eight is formed on rear wheel, vibrations may be less noticeable, but the damage to the suspension is the same. Check all four discs, not just the front ones!

How to eliminate the eight: editing vs. disk replacement

The repair method depends on the type of disc and the degree of deformation:

• 🔨 Stamped discs - almost always subject to editing on a special machine.
• 💎 Cast and forged wheels — straightened only for small deformations (up to 3 mm). Strong impacts often lead to microcracks that cannot be detected without x-rays.

Cost of work in the service:

Disk type	Deformation degree	Cost of editing (RUB)	Recommendation
Stamped	Up to 5 mm	1 500–2 500	Editing is required
Cast	Up to 3 mm	2 000–4 000	Editing is possible
Cast	More than 3 mm	—	Replacement
Forged	Any	3 000–6 000	Editing only by specialists

Can I straighten the disc myself? Theoretically, yes, but only stamped and with deformation of no more than 2 mm. For this you will need:

• 🔧 Jack and stops.
• 🔨 Hammer with a rubber or wooden striker.
• 📏 Caliper for measuring beating.

Algorithm of actions:

1. Remove the wheel and clean the disc from dirt.
2. Secure the disc to the hub (you can use old nuts).
3. Make chalk marks in places of maximum runout.
4. Use a gentle hammer to knock out the dent.

Remove the wheel and place it on a flat surface|

Clean the disc from dirt and rust|

Mark areas of deformation with chalk|

Place a block of wood when hitting with a hammer

-->

⚠️ Attention: Straightening cast wheels with a hammer leads to cracks in 90% of cases! They only use hydraulic presses with heating.

How to prevent the appearance of figure eight: tips for drivers

Prevention is always cheaper than repair. To minimize the risk of disc warping:

• 🚗 Avoid sharp impacts on curbs and holes. If it is impossible to go around the obstacle, slow down to 20–30 km/h.
• ⚙️ Check regularly tire pressure - a flat tire is more easily deformed.
• 🔧 Monitor the tightening torque of the bolts (for most cars - 90–120 Nm).
• 🛠️ Change tires only in proven services that use contactless beading machines.

In winter, the risk of a figure eight is higher due to:

• ❄️ Frozen rutted paths (hitting the ice is equivalent to hitting the curb).
• 🧊 Sudden temperature changes (for example, after washing in a warm box).

If you often drive off-road, install wheels with reinforced rims (for example, Kosei K1 Racing or BBS RX-II). They are 30–50% more expensive than regular ones, but can withstand impacts up to 50% stronger.

Eight on new disks: what to do?

If the disk is deformed immediately after purchase (for example, during installation of a tire), it can be returned under warranty. To do this:

1. Take a photo of the defect and keep your receipt.
2. Contact the store with a complaint (a sample can be downloaded from the Rospotrebnadzor website).
3. If the seller refuses, write a complaint to Rospotrebnadzor or to the platform UN Consumer Protection.

The warranty period for discs is from 1 year (for stamped) to 3 years (for cast). The main thing is to prove that the defect is not your fault.

If a disc is damaged at a tire shop, demand compensation from the service center. According to the law (Article 35 Consumer Protection Law) they are obliged to compensate for the damage or eliminate the defect free of charge. In case of dispute, order independent examination (cost - 3-5 thousand rubles), which will confirm the cause-and-effect relationship.

⚠️ Attention: If you yourself agreed on the risk of damage to the disk (for example, you signed a document regarding possible defects during boarding), it will be impossible to return the money. Always read documents carefully before signing!

FAQ: Frequently asked questions about figure eight on a wheel

Is it possible to drive with a figure eight if the runout is small?

Technically possible, but not advisable. Even a runout of 1–2 mm accelerates suspension wear by 20–30%. If you ignore the problem, after 10–15 thousand km you will have to change the wheel bearings and shock absorbers. In addition, vibrations impair handling, especially on wet roads.

How to check the wheel for figure eight without removing the wheel?

Raise the car on a jack, spin the wheel to 30-40 rpm and hold a chalk or marker to the rim. If the disc is warped, the marker will leave an uneven mark. You can also use dial indicator (error - up to 0.01 mm).

How much does it cost to edit a figure eight in the service?

The price depends on the type of disk and region:

• Stamped disk - 1,500–2,500 rubles.
• Cast disc - 2,000–4,000 rubles.
• Forged wheel - 3,000–6,000 rubles.

In Moscow and St. Petersburg, the cost is 20–30% higher than in the regions. Some services offer discounts when editing four disks at once.

Can the figure eight itself “pass” over time?

No, metal does not have “shape memory” in this context. Without intervention, the deformity will remain or worsen. The exception is microcracks on cast discs, which can expand over time and lead to the destruction of the disc.

What is better: editing the disk or buying a new one?

Editing is more economical if:

• The disk is stamped or cast with deformation up to 3 mm.
• The cost of editing does not exceed 30% of the price of a new disc.
• The disc has no cracks or corrosion.

If the disk forged or the deformation is severe - it is better to buy a new one. Editing in such cases can disrupt the structure of the metal.