Universal side skirt fins: the detail that stretches the entire side
This pair of side fins attaches to the end of the side skirt, just behind the front wheel or in front of the rear wheel. Each piece measures 480 mm long, 120 mm wide, and 80 mm high: enough to create a real break in the line, discreet enough to look credible on a production car. The shape is universal and they are installed using adhesive, without touching the bodywork.
Why install side separators
- Immediate visual effect: the fin marks the end of the side skirt and visually elongates the profile.
- 480 x 120 x 80 mm: dimensions designed for compacts, sedans, and coupes, without overhanging the frame.
- Semi-flexible ABS: the fin flexes when it hits a curb instead of breaking.
- Two finishes: gloss black or carbon look, with UV-resistant clear coat.
- Pre-applied double-sided adhesive: reversible installation, no drilling.
- 2-piece symmetrical kit: left and right sides delivered as a pair.
Fin, duckbill, or separator: what are we talking about
A side fin — sometimes called a duckbill or separator — is a small vertical blade added to the end of a side skirt or fender. On race cars, it detaches the airflow from the side; on a road car, its role is primarily visual: it breaks the smooth surface of the lower bodywork and gives the impression of a wider track. It is also the logical complement to a front lip or a side skirt, when you want a stretched look without committing to a full kit.
Technical specifications
Compatibility: universal, on any flat side skirt. Measure the area before ordering.
Dimensions: 480 mm long, 120 mm wide, 80 mm fin height.
Contents: 2 pieces, left and right.
Material: Semi-flexible ABS.
Finishes: gloss black, carbon look.
Attachment: double-sided adhesive, no drilling.
Condition: 100% new.
Installation and maintenance
Allow 20 to 30 minutes for the pair. Wash and then degrease the area with isopropyl alcohol. Position the fin while dry and check the alignment of both sides with a tape measure, starting from the wheel arch: a 2 cm asymmetry is immediately noticeable. Work above 15°C, remove the film, press down for 30 seconds with firm pressure, then wait 24 hours before the first wash. Then, maintain it the same way as the bodywork.
Frequently asked questions
Where exactly should they be installed?
The most common installation is at the rear end of the side skirt, just in front of the rear wheel, or at the exit of the front wheel arch. Align both sides with a tape measure.
Will it scrape when going over a speed bump?
The fin protrudes 80 mm downwards. On a lowered car, measure the remaining ground clearance before permanently gluing it.
Do you need to drill the bodywork?
No, the attachment is with double-sided adhesive. The installation remains reversible using nylon string and adhesive remover.
Is the carbon look real fiber?
No, it is a woven film under clear coat applied to an ABS support. The visual result imitates fiber, while the price remains that of plastic.
Can they be painted in body color?
Yes: sand with 400-grit sandpaper, apply plastic primer, then clear coat. Do it before installation, as the piece is easier to treat flat.
Two pieces, twenty minutes, no drilling: the profile of your car changes at first glance.
Type: side fins / side separators
Compatibility: universal
Dimensions: 480 x 120 x 80 mm
Contents: 2 pieces, left and right
Material: Semi-flexible ABS
Finishes: gloss black, carbon look
Installation: 20 to 30 minutes on adhesive
Condition: 100% new
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