SUP Classic Fin - US-Box
€29,95
Verified compatibility with US Box boards — correct fin box, correct attachment system.
Shop this fin Complete your setup: SUP Fin 2x Screw Set — €4,95Bluefin SUP Fins
SUP fin compatibility guide
Which Fin Fits My Bluefin SUP?
Bluefin is one of the UK's most popular SUP brands, but it runs two different fin systems depending on the model — so it's worth checking before you order. The standard Cruise range (10'2, 10'8 and 12'0) and the Aura Fit use Bluefin's own Smart Lock, a tool-free flip-latch fin. The Cruise Carbon, Sprint 14'0, Nitro 14'0 and Cruise Tandem 15'0, on the other hand, use a standard US Box fin.
We carry replacement fins for the Quick-Lock/Smart-Lock-style system as well as US Box, so either way there's a good chance we can match your board. Select your exact model below to see which system yours uses and what fits it.
| Model | Fin box | Fit |
|---|---|---|
| Loading compatibility data… | ||
Can't find your exact model? Try the full SUP Fin Finder →
Frequently asked questions
Does the Bluefin Cruise use the same fin as the Cruise Carbon?
No. The standard Cruise (10'2, 10'8, 12'0) uses Bluefin's own Smart Lock flip-latch system, while the Cruise Carbon uses a standard US Box fin. They're not interchangeable.
What is Bluefin's Smart Lock fin system?
It's Bluefin's own tool-free, flip-latch fin box used on the standard Cruise range and the Aura Fit. It's a proprietary quick-lock design, not a US Box, so it needs a matching replacement fin.
My Bluefin Smart Lock lever is loose — is that normal?
The Smart Lock lever is a known wear point on the standard Cruise range over time. If it won't close securely, it's worth checking whether a lever replacement is available before assuming the fin itself is the problem.
Find the right fin
Pick your board's brand and model — we'll check the fin box and show what fits.
Not sure which model you have? See how to identify your fin box →
How the fin finder works
01
Select your board brand
Choose from Red Paddle, Decathlon, Fanatic, Starboard and more.
02
Choose your exact model
We use your model — and model year where necessary — to determine the fin system.
03
Get your compatibility result
We'll show a compatible Eisbach Riders fin when we have one. If we don't, we'll tell you which system to look for instead.
Can't find your SUP?
Our compatibility database is constantly expanding. If your exact board isn't listed, identify your fin box manually or tell us the brand and model.
How we verify compatibility
Our database maps SUP brands and models to their fin-box systems using manufacturer specifications, product information and compatibility checks where available. Where we cannot confidently verify a fit, the Fin Finder tells you to check rather than recommending a product as an exact match.
SUP Touring Fin - US-Box
€45,95
A longer touring fin for straighter tracking on US Box boards.
Shop this fin Complete your setup: SUP Fin 2x Screw Set — €4,95
SUP Classic Fin - US-Box
€29,95
We couldn't confirm your exact model, but boards from this brand typically run a US Box — double-check the length before ordering.
Shop this fin Complete your setup: SUP Fin 2x Screw Set — €4,95
SUP Classic Fin - Quick-Lock
€29,95
Verified compatibility with Quick-Lock boards — correct fin box, correct attachment system.
Shop this fin Complete your setup: —
SUP Touring Fin - Quick-Lock
€45,95
A longer touring fin for straighter tracking on Quick-Lock boards.
Shop this fin Complete your setup: —