FCS Ersatzfinnen – Links, Rechts & Rapid Set

Beim Flusssurfen, in Wavepools oder an steinigen Strandabschnitten passiert es schnell: Eine Seitenfinne bricht ab. Anstatt ein komplettes Thruster-Set zu kaufen, kannst du mit unseren FCS Ersatzfinnen genau die Finne tauschen, die du verloren hast. Erhältlich als linke Finne, rechte Finne oder Rapid Set (beide Seitenfinnen). Passend für alle FCS1 / Double Tab Surfboards.

Gerade an bei den Flusswellen wie dem Eisbach, der Floßlände, dem Wellenwerk Berlin, Surf Langenfeld oder Urbansurf Zürich brechen Seitenfinnen besonders häufig – beim Takeoff oder beim Kontakt mit den Steinen. Der Austausch einer einzelnen Finne ist bis zu 70 % günstiger als der Kauf eines kompletten Fin-Sets und reduziert unnötigen Abfall.

Alle Finnen werden in Deutschland aus recyceltem, glasfaserverstärktem Material hergestellt. Die klassische Foil-Geometrie (flache Innenseite / gewölbte Außenseite) sorgt für Drive, Kontrolle und Stabilität – perfekt für schnelle, druckvolle Flusswellen.
Schneller Versand innerhalb Deutschlands, Österreichs und der Schweiz

How to tell which fin is left or right?

Just place your fins facing downward with the board nose pointing forward — like in the picture.

  • Left fin → sits on the left rail
  • Right fin → sits on the right rail
  • Middle fin → is symmetrical

The inside edge is flat, and the outside edge is curved.

If you’re unsure, match your fin to the photo — or send us a quick picture of your board.

FCS Replacement Side Fins Mounted on Surfboard – Left and Right – River Surf Setup

Why Replace a Single FCS Fin Instead of a Full Set?

Side fins break more often than the center fin—especially in river waves and wave pools. Replacing only the broken side is cheaper, faster, and avoids unnecessary waste. Our Rapid Set is ideal if both side fins are damaged.

Looking for a full thruster setup? Check our FCS Thruster Sets.

Surfboards with FCS Double Tab Fin Boxes – Compatibility Example

Board & System Compatibility

Compatible with all boards using:

  • FCS1 / Double Tab
  • River boards & wave-pool boards
  • Shortboards
  • Softboards with FCS adapter
  • Wakesurf boards

Popular compatible brands:
Firewire, Libtech, Torq, NSP, Softech, Rivver, Buster … and all river surf brands.

Browse all Surf Fins compatible with FCS1.

FAQ

Find the most frequently asked questions below.

  • FCS1 and Double Tab mean the same thing: the original FCS plug system with two tabs. All our replacement fins fit classic FCS1 surfboards and any softboard with an FCS adapter.

  • The inside is flat, the outside curved. If unsure, send us a photo.

  • No. The rapid sets only contain the side fins. You can select a center fin separately.

  • Yes — they’re built for high-impact river use.

  • Yes, as long as the system is FCS1.

Eisbach Riders Founders with River Surf Fin – Munich

Designed in Munich — Inspired by the Eisbach

Born on the Eisbach river in Munich, we’re a small independent team creating sustainable, high-performance gear for river surfers, ocean riders and SUP touring enthusiasts.

We craft our fins from recycled and bio-based materials, supporting cleaner waters and donating a portion of every sale through 1% for the Planet.

Designed and built in Germany, every product is tested and refined on the river, in the ocean, and on long-distance SUP tours—only gear that truly convinces us makes it into the shop.