An unprecedented amount of innovation is currently occurring with fins and fin systems. Ranging from the simple to complex, tool-less fin attachment, to a wide range of other options.

Our choice was to go back to basics, with a system that is light, strong, while at the same time simple to install and easy to use. A design optimized for under the glass installation. The goal was to deliver a system that was both simple and familiar for builders to install, and surfers to use.


GEARBOX is an innovative new fin system. It is strong, light, easy to install, dual tab compatible, and customizable.

A unique patented LOAD BEAM COLLAR offers customization options through the installed cover! System has an inexpensive routing system that simplifies and expedites the installation process.

GEARBOX is a unique new fin box design with some features not found in other fin systems.


Designed to be light without sacrificing strength, every part has been designed for a specific function.


Designed to be placed underneath layers of glass for strength, integrity, and stability.


Patented load beam and cover system enhances bond to lamination.


Patented cover of the system can be customized in numerous ways.


Slot is designed to allow the fin to be moved forward and backwards.


Slot is designed to accomodate any DUAL TAB base fin, adding adjustablity.




Designed for under the glass installation, making for a watertight and clean installation. GEARBOX has a unique load beam collar that utilizes a cover optimized for improved bonding.

Additionally, these covers are customizable in various ways. Boxes are light and strong with a wide range of cant options. The system is dual tab compatible allowing installation of any dual tab fin! Fin base is full length, providing a solid base that makes for a more effective fin.

Unique patented load beam collar with cover, turns the entire top of the cover into a bonding surface. Truss openings in the load beam collar save weight without sacrificing strength. Shape of the beam improves roll strength of the installed system. Features a wide mid-section for the largest possible footprint, without impeding close to rail installation.



A unique aspect of the GEARBOX fin system is the LOAD BEAM COVER. This patented cover fits into the load beam collar of the box. Where it improves bonding and enables various customization options.

All covers now feature a hexagonal pattern scoring on the upper surface to improve mechanical bonding. Covers also feature a cant angle indicator in the form of a recessed number representing the box's cant angle. Located on the outboard edge of the cover. Supported angles are 0º, 2º,4º,6º, and 8º.

Covers also available in a wide range of colors as an additional customization option.

A wide range of customization options that can be applied to the covers to enhance the appearance of the box once installed. These include wood inlays and overlays, colorization of the hex grooves, and our favorite abalone inlays.

Missing image


Includes an inexpensive and versatile routing system. This system supports various install options for different construction techniques.

The routing system enables a multi-cavity install without the need for resetting of the router bit. Designed for use with inexpensive trim routers making the system accessible to a wide range of builders.

Alternate installation options are a convenience for builders working in different materials. Primary installation method is a two-step process, creates a cavity with a shelf on which the box’s collar rests. Lower part of the cavity houses the bottom of the box.

Router jigs simplify the process of creating the cavities. Jigs allow routing without the need to adjust the depth of the router bit. Base jig can be customized for certain installations.



The GEARBOX fin system is made up of a large number of parts.

This catalog presents all of these parts along with prices and SKU numbers.

Eventually everything in the catalog will be available through our online store making it easy for people to purchase anything they might need.

In the meantime, should you need any of these parts please feel free to contact us directly through our CONTACTcontact form and we will be happy to help.

Missing image


The routing system is versatile enough to support different install options. These options suit different construction techniques and materials. Detailed installation guides cover every step of the process for the primary install techniques.

Additionally, the customization guides show how to customize covers for different applications.

The routing system comes with printed installation guide. These guides match the ones found online. Guides provide valuable information on router bit setup. Plus general tips and tricks to achieving a successful install.

There are separate guides for normal polyurethane and EPS foam. These guides highlight the installation differences for these materials.

Missing image


There are a lot of useful pieces of informtation about the GEARBOX fin system.

These cover everything from install guides to details about things like the dimensions of the fin base.

This section of the site has a large collection of downloadable resources.


HANALEI FINS manufacture an innovative and unique range of fins to compliment the system. Featured are both RTM molded, solid fiberglass, longboard center, and custom fins.

We offer a range of completely unique templates that are unlike anything else available in the marketplace. Many of the fin designs feature hollow inside foils for an extra performance boost. We offer both our HRD-KORE RTM molded and custom handmade fiberglass fins.

We produce our custom handmade fins one at a time the old fashioned way, by hand foiling and finishing. These are high quality fins with exceptional foils that feature unique characteristics. The center fin range only available in fiberglass.

Our RTM molded fins deliver a range of our templates in a lightweight fin.

All of the fins in our catalog are available in either GEARBOX or DUAL TAB bases. Select templates also available with FUTURES bases, contact us for details.