Ron D Single Fin - US Box
Description
Program
A modern D-fin that combines stability, trim, and maneuverability for a freer and smoother classic surfing style.
Overview
The Ron D is a modern interpretation of the classic D-fin, designed to preserve the essence of traditional longboard surfing while adding more maneuverability and freedom in transitions. Inspired by historic fin designs, it retains a characteristic upright outline but integrates a subtle cutaway to release the board without sacrificing stability. It is aimed at surfers who enjoy classic style but want to avoid overly locked-in behavior.
The Ron D introduces more accessible pivot capability. Turns feel smoother, transitions more natural, and the board responds better to adjustments. It allows a combination of noseriding, pivots, and stylish turns without losing control.
The Ron D is ideal for elegant, fluid, and expressive surfing between tradition and modernity.
Template
Modernized D-fin template with a subtle cutaway. The rake is low to moderate, with a mostly upright orientation. This favors a pivoting behavior and strong ability to turn around its axis, while still maintaining line control.

Base
The base is wide, providing control and stability in turns. It absorbs pressure from the surfer while maintaining good grip in the wave.

Depth

Surface area
The surface is well distributed, with a slight cutaway on the trailing edge. This maintains control while reducing drag and improving maneuverability.

Setup
The single setup is a configuration based on a single center fin. It prioritizes stability, line reading and smooth trajectories. The fin acts as the main anchor point, guiding the board with precision and continuity.
The feeling is stable and linear: the board holds its line, glides easily and favors long, drawn-out curves rather than quick directional changes. Surfing is built over time, with progressive engagement in each turn.
This is an ideal setup for smooth and controlled surfing, focused on trim, long lines and a natural connection with the wave.

Technical sheet
Ron D Single Fin - US Box 10"5

Buying guide
Who is it for?
The Ron D is aimed at surfers who like a classic style but with more freedom. It suits intermediate to advanced levels. It is perfect for those who alternate between noseriding and turning. It allows for an elegant surf style without being overly technical. The Ron D offers excellent trim stability. The board naturally locks into the wave line, maintaining a stable trajectory that makes it easy to move toward the nose.
It is ideal for surfers who want to evolve without completely changing their style. It is a transitional fin between classic and modern surfing.
What is it for?
The Ron D is particularly suited to versatile retro longboards and modernized logs. It maintains strong noseriding stability while allowing more freedom in turns. Ideal for surfers who alternate between noseriding and rail surfing.
Although it works in a wide range of conditions, it performs best in small to medium, clean, slightly soft waves where you can use glide while still adjusting your line.
A perfect fin for an evolving classic style.
What size?
For large retro logs and noseriders, sizes 9” to 11.5” are the most appropriate. The more you prioritize nose riding, hold, and stability, the larger you should go.
As always:
- larger = more stability, more hold, more control
- smaller = more glide, more freedom, more maneuverability
The right choice depends on the board, the surfer’s weight, wave speed, and surfing style.
Minimum size favors: glide, speed, maneuverability
Maximum size favors: stability, control, noseriding
Example for a 9'2 longboard
- 9” → more speed and maneuverability
- 9.5” → more stability
- 10” → more noseriding
Light surfer → slightly smaller size.
Heavy surfer → slightly larger size.
A simple rule is to choose a fin roughly one inch longer than the board length. This works especially well for classic longboards and noseriders. For more modern or shorter boards, you can slightly reduce size to improve maneuverability and speed.
How to choose between two close sizes?
Within the same fin range, the difference between two sizes (for example 10” and 10.5”) may seem small, but it noticeably affects board behavior.
Example: choosing between 10” and 10.5” on a 9’ longboard
With 10”:
- the board feels more lively
- turns are easier to initiate
- slightly faster glide
With 10.5”:
- the board is more stable
- the tail stays more anchored in the water
- easier noseriding
The 10” suits a more versatile longboard or a surfer who likes to turn. The 10.5” is better suited for a noseriding-focused log.
You can also adjust based on surfer weight, on a 9’6 longboard with the same fin:
- a 65 kg surfer may prefer a 10” for more maneuverability
- a 85 kg surfer may prefer a 10.5” for more control and hold
Weight directly affects pressure on the fin, and therefore the surface needed for stability.
Adjust based on waves
In slow, soft waves, a slightly larger fin helps slow the board down and stay in the pocket.
In fast or hollow waves, a slightly smaller fin makes transitions easier and increases freedom in turns.
Adjust based on surfing style
- noseriding and classic trim → choose the larger size
- more turns and freedom → choose the smaller size
When in doubt between two sizes, ask yourself: “Do I want more stability or more maneuverability?”
Larger → stability, noseriding, drawn lines
Smaller → glide, speed, freedom.
Equipments
Center fin compatible with a US Box system.
Supplied with a fin plate and screw for mounting in a US Box fin system.








