What are decorative thresholds and why are they needed?
Decorative sills are not just a tuning element, but functional protection of the lower part of the body from chips, corrosion and mechanical damage. They cover the vulnerable area between the wheel arches, preventing dirt, sand and reagents from getting on the metal. Particularly relevant for low-slung vehicles or in regions with aggressive weather conditions.
In addition to practical benefits, sills transform the appearance of the car. They visually “lower” the car, making it sportier and more complete. Manufacturers offer models in different styles: from strict chrome to aggressive carbon. It is important to understand that decorative thresholds do not replace power thresholds — they do not strengthen the body during impacts, but only protect the paintwork.
Modern thresholds are made of plastic, aluminum or composite materials. They are attached with double-sided tape, clips or bolts, depending on the model. Properly installed sills prolong the life of the body and increase the resale value of the vehicle.
Types of decorative thresholds: which one to choose for your car
The market offers several types of thresholds, differing in material, method of fastening and design. Main categories:
- 🔹 Plastic thresholds - the most affordable and easiest. Suitable for city cars that do not experience heavy loads. Often imitate metal or carbon.
- 🔹 Aluminum thresholds - stronger than plastic, but more expensive. Ideal for crossovers and SUVs. Requires anti-corrosion treatment.
- 🔹 Carbon sills - premium segment. Lightweight, durable, but very expensive. Most often installed on sports cars.
- 🔹 Illuminated thresholds - with LED strips for a spectacular appearance. Popular among tuning enthusiasts.
According to the method of fastening, thresholds are divided into:
- 🔧 Adhesive - fixed with double-sided tape
3Mor liquid nails. Quick to install, but less reliable. - 🔧 Bolted - fastened with self-tapping screws or clips. They require drilling of the body, but they hold more firmly.
- 🔧 Combined - combine glue and mechanical fastening. The best option for most cars.
When choosing, consider the climate: in regions with frequent temperature changes, it is better to avoid plastic thresholds - they can peel off. Aluminum models with anti-corrosion coating are suitable for winter use.
Top 5 brands of decorative thresholds: comparison and prices
The quality of thresholds directly depends on the manufacturer. We analyzed the market and compiled a rating of reliable brands taking into account the price-quality ratio.
| Brand | Material | Average price (pair) | Features |
|---|---|---|---|
| Hecko | Aluminum/plastic | from 4,500 ₽ | German quality, wide range for European cars |
| EGR | Metallized plastic | from 3,200 ₽ | Budget option, suitable for Korean and Japanese cars |
| Maxton Design | ABS plastic | from 7,800 ₽ | Designer models, carbon imitation, backlight |
| Rieker | Stainless steel | from 12,000 ₽ | Premium segment, high corrosion resistance |
| AutoVaz | Plastic | from 2,100 ₽ | Optimal for domestic cars (Lada, UAZ) |
Important: thresholds from Maxton Design and Rieker often counterfeited. Buy only from authorized dealers to avoid problems with fastening and durability.
For budget cars (Lada Vesta, Renault Logan) there are enough thresholds from AutoVaz or EGR. Owners of premium cars (Audi A6, BMW 5-series) worth considering Hecko or Rieker.
⚠️ Attention: Cheap thresholds without a brand often have inaccurate geometry. This leads to gaps between the threshold and the body, where dirt and moisture accumulate.
Step-by-step instructions for installing decorative thresholds
You can install thresholds yourself if you follow the technology. Let's consider a universal algorithm for adhesive models (the most popular option).
Thoroughly wash and degrease the bottom of the doors
Remove old protective films or rust
Sand the surface with sandpaper P800-P1000
Apply primer (if necessary)
Adjust the thresholds to size (cut off excess) -->
Step 1. Marking and fitting
Attach the threshold to the body and mark the attachment points with a pencil. Make sure it fits snugly along its entire length. If there are gaps of more than 2 mm, the threshold must be adjusted using a heat gun (for plastic) or a vice (for aluminum).
Step 2. Surface preparation
Clean the body from dirt and grease using White spirit or a special degreaser. For better adhesion, treat the surface with anti-silicone. If the body has chips, prime them before installation.
Step 3. Applying glue
Use a professional adhesive sealant, e.g. 3M Scotch-Weld or SikaFlex. Apply it in a zigzag on the inside of the threshold, retreating 1-2 cm from the edges. Do not skimp on glue - a weak layer will lead to peeling.
Step 4. Fixing and drying
Press the threshold to the body and secure with masking tape for 24 hours. Avoid car washing for 3-5 days. For bolt-on models, pre-drill holes and use rubber spacers to avoid corrosion.
Before installation, warm up the thresholds with a hair dryer to 40-50°C - this will make the plastic more elastic and make installation easier.
Installation errors: how to avoid them
Even experienced car owners make mistakes that shorten the service life of thresholds. Let's look at the most common ones:
- 🚫 Ignoring surface preparation — dirt or rust under the threshold will lead to its peeling in 1-2 months.
- 🚫 Using cheap glue — the universal “Moment” is not suitable. You need specialized auto glue.
- 🚫 Incorrect fit — if the threshold protrudes beyond the dimensions of the body, it will cling to the curbs.
- 🚫 Cold Weather Installation — at temperatures below +10°C the glue loses adhesion.
A common problem is peeling of the edges of the threshold. This occurs due to uneven application of glue or insufficient pressure during fixation. To avoid this, use clamps or weights (such as water bottles) to apply even pressure.
Another mistake - tightening bolts on metal thresholds. This deforms the body and leads to corrosion at the attachment points. Tighten the bolts to a maximum torque of 5 Nm (use a torque wrench).
⚠️ Attention: If, after installation, the threshold “walks” when pressed, do not try to fix it with additional glue from above. This will ruin the appearance. It is better to dismantle the threshold, clean the surface and reinstall.
Caring for decorative thresholds: how to extend their service life
Thresholds require regular maintenance, especially in winter. Basic rules:
- 🧼 Washing - use a soft sponge and car shampoo without abrasives. Avoid high pressure washers (may peel off adhesive).
- 🛡️ Protection — after washing, apply wax or ceramic coating to protect against reagents.
- 🔧 Checking fasteners — once every 3 months, inspect the thresholds for peeling. Glue if necessary.
- 🌡️ Temperature — avoid parking next to heat sources (for example, above the hatches of heating mains). Overheating deforms the plastic.
Anti-corrosion treatment is required for aluminum thresholds. Use products based on ML oils or Tectyl. Apply them in a thin layer on the inside of the threshold 2 times a year.
If the sills are chrome-plated, avoid products with acids (for example, for cleaning wheels). They destroy chrome. For care, use special polishes, for example, Sonax Chrome Cleaner.
What to do if the threshold has peeled off?
If the threshold has moved less than 30%, you can glue it with liquid plastic Kudo. Severe peeling requires complete dismantling, cleaning the surface and reinstallation with new adhesive.
Decorative thresholds vs power thresholds: what is the difference
Many people confuse decorative thresholds with power (reinforced) thresholds, but these are fundamentally different products:
| Characteristics | Decorative thresholds | Power thresholds |
|---|---|---|
| Purpose | Paintwork protection, tuning | Reinforcement of the body during impacts |
| Material | Plastic, aluminum, carbon | Steel, titanium alloys |
| Thickness | 1-3 mm | 4-8 mm |
| Fastening | Glue, clips, bolts | Welding or powerful bolts |
| Cost (pair) | 2 000 — 15 000 ₽ | 15 000 — 50 000 ₽ |
Power thresholds are installed on SUVs and cars for extreme driving. They withstand loads when overcoming off-road conditions and protect the body from deformation. Decorative ones are intended for urban use and visual improvement.
Is it possible to combine both types? Yes, some manufacturers (for example, ARB) offer combined solutions: power thresholds with decorative overlays. This is optimal for crossovers that are used both in the city and off-road.
Decorative thresholds do not replace power thresholds! If your goal is protection in case of an accident or off-road, choose specialized reinforced models.
FAQ: answers to frequently asked questions
Is it possible to install decorative sills on a rusty body?
No, this will only make the problem worse. Rust will spread under the threshold, and moisture will accumulate in the cracks. First you need to remove the corrosion (sandblasting or rust converter), then prime it and only then install the thresholds.
How to remove the sills without damaging the body?
Use a hair dryer to heat up the glue and a plastic scraper. Heat the threshold to 60-70°C, then carefully pry it off the edge. Remove remaining adhesive with solvent 646 or Anti-Silikon. Do not use metal tools - they will scratch the paint.
What color thresholds should I choose?
The classic option is body color. For contrast, black or chrome sills are suitable. Silver trim looks good on dark cars. The main rule: the color of the thresholds must be in harmony with the rims and other tuning elements.
Is it possible to paint the thresholds yourself?
Yes, but preparation is required. Plastic thresholds must be treated with an adhesive primer (for example, Plastic Primer from Motip). Aluminum - matt with sandpaper P1200 and degrease. Apply the paint in 2-3 layers, drying between them.
How long will the thresholds last?
Service life depends on material and care:
- Plastic - 2-4 years
- Aluminum - 5-7 years
- Carbon - 7-10 years
With proper care and careful use, thresholds will last longer.