The Greenough 4-A Single Fin is one of the most iconic and widely used single fin templates ever designed. Developed by legendary surf innovator George Greenough, the 4-A has been a staple of the True Ames fin collection for decades. Known for its incredible versatility, drive, and responsiveness, this fin performs exceptionally well in a wide range of surf conditions—from mellow waves to more powerful surf.
Inspired by the hydrodynamic efficiency of tuna tail fins, the Greenough 4-A helped redefine modern single fin surfing by allowing surfers to ride deeper in the pocket and generate more speed through turns.
Design & Performance
The Greenough 4-A features a balanced template that blends stability, drive, and maneuverability.
Key design features include:
- Full base for strong drive off the bottom
- Moderate rake for smooth, arcing turns
- Tapered flexible tip for responsive release
- High-aspect ratio design inspired by tuna tail fins
This combination allows the fin to generate speed while still maintaining control during powerful rail-to-rail surfing.
Bottom Line Performance
The 4-A delivers a highly responsive ride that excels at both generating speed and maintaining control in the pocket. Its balanced design allows surfers to perform powerful bottom turns, long carving lines, and fluid transitions.
Few fins offer the same combination of stability, drive, and maneuverability.
Construction
Solid fiberglass construction provides durability, strength, and a consistent flex pattern. The flat matte finish maintains a classic look while delivering reliable performance session after session.
Who It’s For
The Greenough 4-A is ideal for surfers looking for a versatile single fin that works across multiple board types and wave conditions. It performs exceptionally well in:
- Classic longboards
- Performance single fins
- Mid-length surfboards
- 2+1 setups
Surfers who enjoy smooth carving lines, speed generation, and fluid rail surfing will appreciate the balanced feel of this legendary fin.
Ideal Wave Conditions
The Greenough 4-A works across a wide variety of waves—from smaller everyday surf to more powerful conditions. Its ability to hold through turns while still releasing when needed makes it an excellent all-around fin for surfers around the world and here on the waves of Eastern North Carolina.
