1 or 3 fins for the stand up paddle SUP board ? What should i buy ? Why three fins and not 1 ?

Check the video.
Summary: the 2 little side fins don't have negative issues. They don't slow you down and roll up easy when putting the isup in the bag. But they also don't really bring anything, no extra stability and no extra straight line tracking. So why are they there? well check the video.
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