Fin sizing for twin

3 months ago
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AI.Dave
AI.Dave
TAS
168 posts
TAS, 168 posts
10 Mar 2026 5:49pm
i've an old 71l starboard evo IQ which i've only ever used as a single fin setup. Great fun to ride, light fast and responsive

Would 14.5cm be too small for the twin setup? 4.7 to 4.2 weather for DTL

Can try and see but just want to be in the ball park so i dont spend my sess swapping fins



Muppet
Muppet
WA
124 posts
WA, 124 posts
10 Mar 2026 3:46pm
AI.Dave said..
i've an old 71l starboard evo IQ which i've only ever used as a single fin setup. Great fun to ride, light fast and responsive

Would 14.5cm be too small for the twin setup? 4.7 to 4.2 weather for DTL

Can try and see but just want to be in the ball park so i dont spend my sess swapping fins





I think that board was stocked with twin 15cm, so 14.5cm will be fine if you're not too heavy.
AI.Dave
AI.Dave
TAS
168 posts
TAS, 168 posts
10 Mar 2026 8:38pm
thanks! i'll give it a go
Rango
Rango
WA
862 posts
WA, 862 posts
10 Mar 2026 7:25pm
If they have a wide base they should work . I use the upright MB twinzers in mine at about 16.
Shame twins fell out of favour ,so fluid on the right wave ,and fizz through turns.
www.surfsailaustralia.com.au/product/mb-twinzer-fin-nuss-box#surf-sail-clothing-hardware
Think k4 leons would work well to.
AI.Dave
AI.Dave
TAS
168 posts
TAS, 168 posts
11 Mar 2026 7:56am
cheers Rango, i see what you mean - upright with some width. Mine might not be lifty enough, they have alot of sweep... will see


www.duotonesports.com/en/us/products/duotone-fin-quad-center-slot-2pcs-2024-14240-8042?variant=46234341409000
Manuel7
Manuel7
1351 posts
1351 posts
11 Mar 2026 7:31pm
Do you sail with short fins? Easy spot with lots of wind? Light weight?

4.7 could be a touch short. 4.2 no problem.
Basher
Basher
597 posts
597 posts
2 Jun 2026 8:18am
The twin fin size you need relates to your weight, and not just the board. So, heavier guys may like bigger fin’s in a twin, depending on how backfooted you sail. ‘Bigger’ can mean longer, or just more area to push against.
I still have Nuevo twin fin boards and have the original Starboard- supplied Drake G10 fins , which were/are wide at the base, and so have a lot of fin area. I tend to use 14.5 cms fins for those shapes, but heavier guys might go to the Drake equivalent in 15.5cms. They are stiff fins, by modern standards.


But if you go for aftermarket twin fins, like from K4, then I use 17cms rockets, which are much narrower in profile, and they flex a lot more. The Rockets are fast, and best for jumping.
I also use more swept back K4s for wave riding, Scorchers, and mine (I’m 75 kgs) are just 16cms long. These flex even more, because of the swept back profile.
The Severne fins also work well, set in my 87 litre Pyro, when I use that as a twin.
Basher
Basher
597 posts
597 posts
2 Jun 2026 8:18am
The twin fin size you need relates to your weight, and not just the board. So, heavier guys may like bigger fin’s in a twin, depending on how backfooted you sail. ‘Bigger’ can mean longer, or just more area to push against.
I still have Nuevo twin fin boards and have the original Starboard- supplied Drake G10 fins , which were/are wide at the base, and so have a lot of fin area. I tend to use 14.5 cms fins for those shapes, but heavier guys might go to the Drake equivalent in 15.5cms. They are stiff fins, by modern standards.


But if you go for aftermarket twin fins, like from K4, then I use 17cms rockets, which are much narrower in profile, and they flex a lot more. The Rockets are fast, and best for jumping.
I also use more swept back K4s for wave riding, Scorchers, and mine (I’m 75 kgs) are just 16cms long. These flex even more, because of the swept back profile.
The Severne fins also work well, set in my 87 litre Pyro, when I use that as a twin.
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