Choose The Right Fin






SINGLE FINS: The single fin is the original fin setup. Single fin setups are common on long boards and retro shortboards. They are usually long and wider than other fins, which make the board controllable with only the one fin.


2+1 Setup: For added stability to your single fin go with 2 sidebites. Best for use with smaller single fins. For instance if you normally ride a 8" single fin go with a 6.5" or 7" single fin and a 3.7" sidebite. 

TWIN FINS: The twin fin setup has two fins near the rail. This setup provides extra speed and easier turning. Smooth, long, carving, drawn out turns along your entire rail describe the twin fin set up. 

THRUSTER (3-FINS): The most common setup, the "thruster" is a tri-fin. All the fins are the same size, with two semi-parallel (slightly toed-in, usually, and slightly canted outward, usually) fins mounted near the rails 10-12 inches forward of the tail and a middle fin at 3-5 inches. We have Tri-Fins available in Futures and FCS compatible.

QUAD FINS: The quad setup is four fins, two on each side, in a similar position to the rail fins on a thruster. The fronts are typically larger than the rears but this is not always the case. The rears are nearly always inboard and aft of the fronts . The exact measurements and configuration of the quad set-up can vary pretty widely. This setup is often used in short boards and provides more lift and control surface near the rail. 

CENTER FIN / 5th Fin: Adding a center fin as a stabilizer can help in bigger waves and add more hold to bottom turns.



All surf fins are not created equal! We take advantage of a vast amount of fin manufacturing experience to create fins that work in many different applications. Designs are executed using the required materials and foils to create the highest performance surf fins available today.

Flex is a very important element in our designs. Many of our surfboard fins come with a tuned flex. A fin that has flex can be very different than a fin without flex. The flex concept brings to life an otherwise average ride. Cutbacks have more power and bottom turns have more projection.

True Ames Surf Fins incorporate a constant foil which means you will not find any flat spots on our fins that may cause water disturbance which will ultimately cause poor performance. Our bigger solid color fins are foiled from 7/16” solid 6oz. glass sheet stock. Smaller fins do not need to be so thick to have the proper foil.

The depth of your fin is measured from base to tip vertically. Adjusting your fin size will affect the performance of your board. Larger fins provide more stability and control, so a larger board will need bigger fins. For example a 9’6” single fin surfboard needs at least a 9.5” fin and if nose riding is most important to you then you will find bigger fins give more forward control.
The outline of a fin is what determines the area and the look. The way the area is distributed on the fin is what makes fins individual and work in so many different ways.
A wide base fin with a wide tip is the most stable but not forgiving.
A narrow base fin with a narrow tip will be very loose and fast but unstable at slow speeds.
The fin’s sweep (or rake angle) affects the board’s ability to carve turns.
A more vertical fin will make tight turns and fast directional changes while a more raked fin will carve wider arcs and handle more power through turns.

Tail width is also a factor in fin choice.
Narrow tail boards do not require deep fins because there is less distance from the fin to the rail.

A wide board requires a deeper fin than a narrower board. For example an 8’ egg style board that is on the wide side should use about an 8.5” to 9.0” fin. A narrow tail single fin board that is 7’6” can use a fin in the 7” to 8” range.



Sold Out