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True Ames Greenough 4-A

True Ames

Greenough 4-A

  • Box:Longboard / Single-Fin Box
  • Size:9.75"
  • Construction:Hand-laid fiberglass

$121

Typical lead time: 4–11 days.

Fits 10" longboard / single-fin boxes.

Universal single-fin box. Standard across longboards from every brand.

Not sure what your board has? Read the fin-box guide.

Buy at True Ames

Native Lundquist checkout is coming soon. For now, this links to True Ames directly.

About this fin

The Greenough 4-A Single Fin is the most iconic, functional and versatile single fin available, because it works extremely well on just about every type of surfboard. The 4-A has been True Ames' bread and butter for over 40 years now, and it is still the most popular single fin design there is due to it's all-around and well-balanced performance.

Need help picking a fin? Read the fin guide or message Blake.