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Forums > Windsurfing Wave sailing

Fin sizing for twin

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Created by AI.Dave Tuesday, 10 Mar 2026
AI.Dave
TAS, 120 posts
Tuesday , 10 Mar 2026 5:49PM
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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
WA, 115 posts
Tuesday , 10 Mar 2026 3:46PM
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Select to expand quote
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
TAS, 120 posts
Tuesday , 10 Mar 2026 8:38PM
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thanks! i'll give it a go

Rango
WA, 834 posts
Tuesday , 10 Mar 2026 7:25PM
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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
TAS, 120 posts
Wednesday , 11 Mar 2026 7:56AM
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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
1343 posts
Wednesday , 11 Mar 2026 7:31PM
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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.



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"Fin sizing for twin" started by AI.Dave