Radar Waterskis Fin Setting Guide

Any high-level skier will tell you, a world-class ski is only as good as its tuning. Adjusting your fin can feel like "pissing in the wind" if you don't have the right tools, but once you understand the mechanics, it becomes your most powerful tool for consistency in the course.

To dial in your Slalom ski, you need a high-quality 8-inch digital caliper. You’ll be measuring three primary dimensions:

Distance from Tail (DFT): This controls how much "tail" is behind the fin. Moving the fin back makes the ski feel more stable and "bigger"; moving it forward makes it more maneuverable but less forgiving.
Depth: Deepening the fin increases stability and tracking (making it "track like a laser"). Reducing depth allows the ski to roll over more easily into the turn.
Length: This is the distance from the front of the fin block to the tail of the blade.

Measure Twice: Always zero your calipers before every measurement.

Don't Over-Tighten: Use a 5/32” Allen wrench. Tighten until clamped but avoid stripping the aluminum threads.

The "0.010" Rule: In the world of fin tuning, ten-thousandths of an inch is a massive change. Adjust in increments of 0.005" and take notes on every set.

Tip Diving? If the ski tip is biting too hard in offside turns, move the fin rearward or tilt the front of the fin up slightly.

Squirrely Offside? If the ski feels "wild" or starts the turn too aggressively, try adding 0.005" of length.

Too Much Drag? If you're struggling to cross the wake with speed, try moving the fin forward to allow the ski to rotate more freely.

If you’re still feeling lost, their team of experts is just a phone call away to help you find your "sweet spot."

Give us a call or email if you have questions setting up your ski. Here's some of the tools you will need.

Calipers Tool Set includes everything you need to tune your waterski

Buy Calipers Separately

Buy Fin Wing Angle Gauge Separately

More questions about tuning your waterski? Check out the FIN WHISPERING book

Give us a call or email if you have questions setting up your ski. Here's some of the tools you will need.

Calipers Tool Set includes everything you need to tune your waterski

Buy Calipers Separately