The spar in a car: where it is located, what it looks like and why it is called the “spine” of the car

When it comes to car durability, the first thing that comes to mind is spars - these invisible, but critically important elements of the body. They are like bones in a skeleton: they are not conspicuous, but without them the car will turn into a shapeless pile of metal at the first serious impact. However, many drivers, even with many years of experience, do not know exactly where is the side member located in the car and what it looks like. This article once and for all closes knowledge gaps: from layout diagrams to the consequences of damage - with photos, tables and expert advice.

We will not burden you with a dry theory about “power elements of a supporting structure.” Instead, let's show how The side members on 90% of cars are located parallel to the floor of the cabin - under the feet of the driver and front passenger, and their front ends rest against the bumper area. You will find out why Toyota Corolla and Volkswagen Passat they are hidden under the casing, and on UAZ Patriot they are visible to the naked eye. And the main thing is how to determine by 3 signs that the spar is bent, even if the body is externally intact.

What is a spar and why is it needed in a car?

Spar (from French longeron - “longitudinal beam”) - this is the main body strength element, which perceives and distributes loads during movement, braking and, critically, during accidents. Think of it as a rail on which the entire front part of the car “rides.” Without side members, even a slight blow will cause the engine to move into the cabin and the doors will stop opening.

Main functions of spars:

• 🔧 Impact Energy Absorption — in the event of an accident, they deform in a controlled manner, saving passengers from injury.
• 🚗 Suspension support — levers, shock absorbers and stabilizers are attached to them.
• 🔄 Maintaining body geometry — even under heavy load (for example, when towing), the side members maintain the shape of the car.
• 🛠️ Simplifying repairs - on many models they can be replaced separately from the body (for example, with Nissan Almera or Renault Duster).

Fun fact: racing cars Formula 1 The spars are made from carbon fiber to make them lighter but stronger than steel. And on trucks (for example, Scania or Volvo FH) they are made of high-strength steel up to 8 mm thick - after all, the loads there are several times higher than those of passenger cars.

Where exactly is the spar located: location diagram

In 99% of passenger cars, the side members are located symmetrically on both sides of the body, stretching from the front bumper to the rear axle (or to the middle of the car if the body is monocoque). They are easy to imagine as two parallel “rails” along which a car “rolls”. Let's take a closer look:

Front:

• 📍Start in the zone front bumper, often hidden under plastic protection.
• 🔩 Attached to them engine mounts, radiator and suspension elements.
• ⚠️ This is where the side members most often bend in frontal collisions.

Central part:

• 🚪 Pass under rapids (you can see it if you look under the car).
• 👤 They are located under the feet of the driver and front passenger - therefore their damage is life-threatening.
• 🔧 They often weld here amplifiers to increase rigidity (for example, on BMW 3 Series).

Rear:

• 🔄 On front-wheel drive cars (for example, Lada Vesta) end in the area of the rear wheels.
• 🚛 On rear-wheel drive and all-wheel drive (for example, Toyota Land Cruiser 200) can reach the rear bumper.
• 💥 During rear impacts, they are deformed less often than front ones, but still require inspection.

To better visualize the location, look at the diagram below (valid for most sedans and hatchbacks):

Vehicle zone	Spar location	What is attached to it	Typical damage
Front bumper	Beginning of the spar (often with “ears” for fastening)	Radiator, headlights, bumper	Crumple, cracks upon impact
Engine compartment	Passes under the engine (seen from below)	Engine mounts, subframe	Curvature, breaks in welds
Salon (underfoot)	Hidden under carpet and sound insulation	Pedals, steering column	Deformation due to strong frontal impacts
Rear axle	Ends or connects to the rear beam	Rear suspension, fuel tank	Displacement in rear accidents

What does the spar look like on different cars: photos and features

The appearance of the side members greatly depends on body type and car make. On some models they are visible to the naked eye, on others they are hidden under a layer of cladding and sound insulation. Let's look at a few examples:

1. Passenger cars (sedans, hatchbacks, crossovers):

• 📸 On Volkswagen Golf or Skoda Octavia the spars are U-shaped beams with stiffening ribs. They are clearly visible if you remove the front bumper.
• 🔧 On Hyundai Solaris and Kia Rio The front side members often bend during impacts at speeds above 30 km/h - this is the weak point of Korean cars.
• 🛡️ On Toyota Camry the side members are reinforced with additional plates - making the car more difficult to “fold” in the event of an accident.

2. SUVs and pickups:

• 🚙 On Nissan Patrol or Mitsubishi Pajero the spars are made from thick steel (4–6 mm) and are often box-shaped for increased strength.
• 🛻On Ford F-150 (American pickup truck) spars are separate frames that are bolted to the body (and not welded, like in passenger cars).

3. Old and domestic cars:

• 🚗 On VAZ 2107 or VAZ 2110 the spars are thin and often rust - this is one of the reasons why the “classic” is difficult to restore after an accident.
• 🏗️ On UAZ Hunter or GAZelle The side members are visible from the outside - they are part of the frame, not the body.

Photo for comparison (description of appearance):

• 📷 Volkswagen Passat B6 side member: bent beam with holes to reduce weight, coated with anti-corrosion.
• 📷 Toyota Land Cruiser 200 spar: solid box-shaped structure with reinforcements, galvanized.
• 📷 Spar VAZ 2114: A thin steel beam, often with traces of rust.

Why do side members rust faster on some cars?

On machines without galvanization (for example, Daewoo Nexia or Chevrolet Lanos) spars begin to rot from the inside after 5–7 years. The reason is the accumulating moisture in the cavities, which is not visible from the outside. To check, tap the side member with a metal object: a dull sound means rust.

How to check a spar for damage: 5 signs of a problem

A bent or cracked spar is not just a “jamb”, but serious security threat. Such a machine cannot be operated until the defect is corrected. Here's how to recognize the problem:

1. Visual signs:

• 🔍 Uneven gaps between body panels (for example, between the hood and the fender).
• 🚪 Doors or hood do not close well - this is a sign of spar displacement.
• 📏 Body asymmetry (one headlight is higher than the other, the bumper is skewed).

2. Damage when viewed from below:

• 🔧 Dents or wrinkles on the side member (visible on the pit or lift).
• 💥 Cracks in welds - a critical defect requiring urgent repair.
• 🔩 Mounting hole offset (eg for subframe or engine mounts).

3. Vehicle behavior on the road:

• 🚗 The car pulls to the side when driving in a straight line (even with aligned wheel alignment).
• 🔄 Uneven tire wear - a sign of a violation of the body geometry.
• 💨 Creaks or knocks in the front when driving over uneven surfaces.

If you find at least one of these signs, do not delay diagnosis. A bent side member not only affects handling, but can also lead to collapse of the front part of the body in the next accident - even with a small impact.

Inspect the gaps between the body panels|Check if the doors and hood close easily|Drive the car into a pit and inspect the side members from below|Drive in a straight line and check if the car is drifting|Assess tire wear for unevenness-->

What to do if the spar is bent: repair or replacement?

If diagnostics confirm damage to the spar, you have two options: repair (straightening) or replacement. The choice depends on the degree of damage, car brand and budget. Let's look at the pros and cons of each method:

1. Straightening (straightening) of the spar:

• ✅ Cheaper than replacement (on average 15–30 thousand rubles versus 50–100 thousand).
• ✅ Suitable for minor deformations (if the metal is not cracked).
• ❌ Does not restore factory strength — the spar becomes weaker.
• ❌ Not all service stations undertake straightening (requires special equipment).

2. Replacing the spar:

• ✅ Restores factory strength — the new spar will not be inferior to the original.
• ✅ Work guarantee (usually 1–2 years).
• ❌ Expensive — the price depends on the model (for example, on Mercedes-Benz E-Class replacement will cost 150+ thousand rubles).
• ❌ Difficult to find original spare parts for rare or old cars.

Important: on some vehicles (for example, Audi A4 or BMW 5 Series) the side members are welded to the body at dozens of points. Their replacement requires complete disassembly of the front part and often leads to problems with electronics (for example, with driver assistance system sensors).

⚠️ Attention: If the side member is damaged in the airbag mounting area, repair may not be possible! On many modern cars (for example, Volvo XC60 or Subaru Outback) in this case, the entire front part of the body must be replaced.

Is it possible to drive with a bent side member? Consequences and risks

Technically, yes, a car with a bent side member will drive. But It's like driving with a broken spine: sooner or later this will lead to serious problems. Here's what it entails:

1. Deterioration in controllability:

• 🚗 The car will be “driven” to the side, especially at high speed.
• 🔄 The steering wheel may become tight or, conversely, too light.
• 💨 When braking, the car will drift (like on ice).

2. Rapid wear of other components:

• 🔧 Suspension - shock absorbers and levers will fail 2-3 times faster.
• 🛞 Tires — uneven wear will lead to the need for replacement after 10–15 thousand km.
• 🔩 Steering rack - may jam due to body distortion.

3. Danger in an accident:

• 💥 Bent spar does not absorb impact energy, and transfers it directly to the salon.
• 🚗 In a frontal collision, the engine may shift and break through the partition between the engine compartment and the passenger compartment.
• 🛡️ Airbags may not deploy correctly (for example, they may not deploy or deploy late).

If you do decide to drive with a damaged side member, at least take these precautions:

Drive only at low speeds (up to 60 km/h)|Avoid sudden maneuvers and braking|Check the condition of the suspension and tires more often|Do not carry heavy loads|Be prepared for the fact that the car may not pass inspection-->

⚠️ Attention: Insurance companies often refuse to pay under CASCO if they discover that the car was driven with a damaged side member. This is regarded as “deliberately creating an emergency situation.”

How to protect spars from damage: prevention

Preventing damage to side members is easier than repairing them. Here are some practical tips:

1. Careful driving:

• 🚦 Maintain your distance - most head-on accidents occur due to failure to maintain the interval.
• 🚧 Drive around potholes and speed bumps at speed - sharp impacts on the suspension are transmitted to the side members.
• ❄️ In icy conditions, brake with the engine, not the brake pedal - this reduces the risk of impact.

2. Corrosion protection:

• 🔧 Treat the spars every 2-3 years anticorrosive (for example, Dinitrol or Tectyl).
• 🚿 Wash your car at least once every 2 weeks in winter - salt eats away metal.
• 🕳️ Check the drainage holes in the thresholds - if they are clogged, moisture accumulates inside the side members.

3. Proper repair after an accident:

• 🔨 Insist on geometric examination body after an accident (even if the damage seems minor).
• 🛠️ Choose a service station with slipway (special equipment for body extraction).
• 📄 Demand a guarantee for the work - good workshops provide it for at least 1 year.

An interesting life hack: on some cars (for example, Skoda Kodiaq or Volkswagen Tiguan) the side members are protected by plastic covers. They can be further strengthened Kevlar film - this will reduce the risk of chipping and corrosion.

FAQ: Frequently asked questions about side members in a car

❓ How many spars are there in the car?

In most passenger cars they two - left and right. However, on some models (for example, Mercedes-Benz S-Class or BMW 7 Series) there may be additional cross reinforcements, which are sometimes also called spars. On frame SUVs (for example, Toyota LC70) spars are part of the frame, and there can be more than two of them.

❓ Is it possible to check the spar yourself?

Yes, but only visually. You will need:

1. Drive the car into a pit or overpass.
2. Clean the side members from dirt (using pressurized water).
3. Inspect for dents, cracks or rust.
4. Check the gaps between body panels.

For accurate diagnosis you need laser geometry meter or a slipway - such equipment is only available in car services.

❓ Which spar is stronger: on a sedan or crossover?

On crossovers and SUVs, side members thicker and strongerthan on sedans, because:

• They have a higher center of gravity, so additional rigidity is needed.
• They are designed for off-road driving, where the load on the body is higher.
• The vehicle weighs more, so the side members are made of high-strength steel.

For example, on Toyota RAV4 the metal thickness of the spar is 2–3 mm, and on Toyota Camry — 1.5–2 mm.

❓ Why do spars rust faster on some cars?

Main reasons:

• 🔧 No galvanization (for example, on Daewoo Matiz or Chevrolet Aveo).
• 💧 Poor ventilation - If the drainage holes are clogged, moisture accumulates inside.
• 🧂 Operation in aggressive conditions (winter roads with salt, high humidity).
• 🛠️ Low quality anti-corrosion treatment at the factory.

To slow down corrosion, treat the side members once a year wax compounds (for example, Waxoyl).

❓ Is it possible to restore the spar by welding?

Technically yes, but this extremely unreliable. Welding weakens the metal, and in the next accident the side member may crack at the seam. Allowed only spot welding small cracks (up to 2–3 cm) followed by reinforcement with overlays. Full renovation includes:

1. Cutting out the damaged area.
2. Welding a new fragment (preferably from the original workpiece).
3. Reinforcement of seams with additional plates.

On modern cars (for example, Audi Q5 or Volvo XC90) spars are often made of high-strength steel, which cannot be welded - only replaced.