What are these structures and why are they confused with roof racks?
If you've ever looked at the roof of a car and noticed metal or plastic arches stretching from the A-pillar to the rear, you've probably wondered: what are they called? Many people mistakenly call them "trunks", but in fact this is not entirely true. These elements are railings (or roof rails), and they perform a completely different function than classic trunks.
Rails are longitudinal guides installed on the roof of the car, which serve as the basis for attaching additional equipment. They can be integrated into the body (hidden) or protrude above the surface (external). While roof rack - this is a separate structure that is attached either to the railings or directly to the body through special points. Confusion arises because visually both elements are located in the same zone, but their purpose is fundamentally different.
In this article we will figure out how to correctly name roof bars, what types of roof rails and roof racks there are, and also tell you why they are needed and how to choose them for a specific car model.
Railings: main types and their features
Railings are divided into several types depending on the design, material and method of fastening. Their main task is to ensure reliable fixation of cargo or additional equipment (for example, boxes, bicycle racks or ski racks). Let's look at the main varieties:
- 🔹 Hidden railings — built into the body and almost do not protrude above the roof surface. Often found on premium cars (for example, Audi Q7 or BMW X5). Their advantage is their aesthetic appearance, but special adapters are required to install the rack.
- 🔹 External railings - metal or plastic arches that protrude noticeably above the roof. They are universal and fit most mounts, but can increase aerodynamic drag.
- 🔹 Railings with integrated crossbars - a combined system, where the longitudinal arches already have transverse crossbars (for example, on Volvo XC90). Such railings allow you to secure cargo without additional accessories.
- 🔹 Roof rails for SUVs - reinforced structures with increased load capacity (up to 100–150 kg), often found on Toyota Land Cruiser or Nissan Patrol.
Material also plays a key role: aluminum rails are lighter and more resistant to corrosion, but steel rails can withstand more weight. Plastic options (for example, on Kia Sportage) are cheaper, but less durable and designed for light loads.
Roof racks: how they differ from roof rails
If the railings are “rails” for fastening, then roof rack (or roof rack) is a full-fledged cargo platform that is mounted either on rails or directly to the body through special points. There are two main types of racks:
- Cross racks (cross bars) - two horizontal crossbars that are attached to the railings. They serve as the basis for securing cargo (for example, boards, skis or luggage boxes). Popular brands: Thule, Yakima, Hapro.
- Full size racks - a solid platform that occupies almost the entire roof area. Such structures are often installed on SUVs and minibuses for transporting large cargo (for example, boats or construction materials).
It is important to understand that a roof rack without rails can only be installed on vehicles with factory roof mounting points (e.g. Volkswagen Transporter or Ford Transit). In other cases, railings are a mandatory intermediate link.
⚠️ Attention: Exceeding the load capacity of the roof rack (typically 50–75 kg) may result in roof deformation or loss of control at high speed due to a shift in the center of gravity.
How to choose roof rails or trunk for your car
When choosing roof rails or racks, there are several key parameters to consider:
| Criterion | Railings | Trunk (cross bars) |
|---|---|---|
| Load capacity | Up to 100 kg (distributed load) | 50–75 kg (depending on model) |
| Compatibility | Matched to car model | Universal or for specific railings |
| Material | Aluminum, steel, plastic | Aluminum, steel (with anti-corrosion coating) |
| Aerodynamics | Hidden - minimal resistance | Increases fuel consumption by 0.2–0.5 l/100 km |
Before purchasing, be sure to check:
Compatibility with car model (search by VIN or year of manufacture)
Maximum load capacity (indicated in the instructions for the car)
Mounting type (to rails, body or universal)
Availability of a safety certificate (especially for European brands) -->
For example, for Skoda Octavia railings will fit Thule WingBar Evo, and for Toyota RAV4 - trunk Yakima JetStream with a load capacity of up to 82 kg. Always check your vehicle's specifications as exceeding the load may void your warranty.
Installation of roof rails and racks: step-by-step instructions
Installing roof rails or roof racks is a task that you can do yourself if you follow the instructions. Let's look at the process using the example of installing cross bars on external rails:
- Preparation: Clean the railings from dirt and degrease the mounting points. Check the contents of the trunk (there must be rubber gaskets, keys and instructions).
- Markup: Place the crossbars at an equal distance from each other (optimally 50–60 cm from the edge of the roof).
- Mount: Secure the cross bars to the rails using bolts or clamps (depending on the model). Tighten the fasteners gradually to avoid distortion.
- Check: Rock the trunk with your hands - it should not play. After installation, check the tightness of the rubber seals to avoid leaks.
For vehicles without roof rails (for example, Hyundai Solaris) you will need a trunk with fastening to the doorways. In this case, it is important not to damage the paintwork, so use protective stickers or gaskets.
⚠️ Attention: After installing the trunk, be sure to adjust the tire pressure (increase by 0.2–0.3 atm) and check the operation of the wipers - they should not touch the fasteners.
If you rarely use the rack, remove it after your trip. This will reduce fuel consumption and noise at high speed.
Common mistakes when using roof rails and racks
Even experienced drivers sometimes make mistakes that can lead to equipment failure or an accident. Here are the most common of them:
- 🚫 Excessive load. For example, if you put 80 kg on a roof rack with a maximum load capacity of 60 kg, this can deform the roof or break the fastenings at speed.
- 🚫 Incorrect load distribution. Heavy objects should be located closer to the center of the roof, and not shifted to one edge.
- 🚫 Ignoring aerodynamics. Oversized loads (for example, boards) increase windage, which is dangerous in crosswinds.
- 🚫 Lack of fixation. Even light luggage (such as a backpack) must be secured with straps, otherwise it can be blown off the roof.
According to traffic police statistics, about 15% of accidents involving a load on the roof occur due to its improper securing or excess weight. To avoid problems, always use certified fasteners and check the secure fit before riding.
What happens if you drive with an unsecured load?
At speeds above 60 km/h, an unsecured object (such as a bicycle or suitcase) can move backward, hit the windshield or fly out into the road, creating an emergency situation. In addition, vibration from loose fasteners accelerates wear on the rails and body.
Maintenance and care of roof rails and racks
To extend the service life of equipment, it is necessary to regularly carry out preventive measures:
- 🧹 Cleaning: After each ride, remove dirt and salt from the roof rails and mountings, especially in winter. Use a soft brush and car shampoo.
- 🛠️ Lubrication: Once every six months, treat moving parts (clamps, bolts) with silicone grease or WD-40.
- 🔍 Check: Before a long trip, inspect the rubber seals and fastenings for cracks or corrosion.
- 🎨 Protection: If the railings are metal, renew the anti-corrosion coating once a year (for example, with a spray Liqui Moly).
It is recommended to store removable luggage racks in a dry place, having previously cleaned them of moisture. If chips or rust appear on the rails, it is better to replace them, as corrosion can spread to the body.
Regular maintenance of roof rails and roof racks not only extends their service life, but also prevents damage to the roof of the car.
FAQ: Answers to frequently asked questions
Is it possible to install roof rails on a car if they were not there from the factory?
Yes, but this will require drilling holes in the roof, which can lead to corrosion or damage to the interior seal. It is better to use universal racks with fastening to doorways (for example, Hapro Touring).
What is the maximum weight that can be carried on the roof?
It depends on the car model. For example, for Toyota RAV4 permissible load - 75 kg, and for Lada Vesta Cross - only 50 kg. The exact data is indicated in the operating instructions.
Do roof rails affect fuel consumption?
Yes, even empty roof rails increase aerodynamic drag by 2–5%, which leads to an increase in consumption by 0.1–0.3 l/100 km. A loaded trunk can add up to 1 l/100 km.
Can the roof rails be painted to match the body color?
Technically yes, but it may damage the anti-corrosion coating. It is better to use vinyl stickers or special covers (for example, from Thule).
Do I need to register my roof rack with the traffic police?
No, if it does not change the dimensions of the car (does not protrude more than 20 cm on the sides or 30 cm in the front/rear). Otherwise, changes to the PTS will be required.