Beyond the number of fins, the physical "specs" of your fins can completely change your board's behavior. A Comprehensive Surfboard Fin Guide - Bodhi Surf + Yoga
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If you are migrating from Clash to Surfboard (or vice versa), here is the mental mapping:
Understanding your surfboard config is the difference between fighting the ocean and dancing with it. Whether you are a beginner looking to buy your first board or an advanced surfer looking to tweak your equipment for a specific break, this guide will break down the anatomy of the surfboard configuration.