Specific calculators, planners, and explainers for jobs that usually get buried in forums.
HTML-first, no account wall
Shareable URLs and direct outputs
Surfing · Recommender · Interactive explainer
Surfboard fin setup selector
Choose between thruster, quad, twin, twin plus trailer, 2+1, and single-fin setups using your board, fin boxes, surfer weight, wave shape, and the feel you want underfoot.
What this page is solving
Static fin charts usually answer one slice of the problem. Real fin choice depends on the board under your feet, the boxes actually installed, how much push is in the wave, and whether you want release, hold, or easy trim.
- Ranks only the setups your board can actually run.
- Combines board family, session shape, and weight-based sizing.
- Shows a backup setup instead of pretending one answer fits every mood.
Setup cheat sheet
Best daily-driver answer when you want predictable release, easy rail-to-rail timing, and control in punchier pockets.
Fast down the line with lots of drive. Great when the wall offers speed, but it can feel trackier if you want a pivoty top turn.
Loose and lively for fishy boards and softer surf. Trailer adds a little insurance if a pure twin feels too wild.
More about trim, drawn-out arcs, and confidence on midlengths and longboards than instant release in a tight pocket.