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True Ames
True Ames Greenough 4A Single Fin dérive de surf
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.
★★★★★5.0 (222)
En stock
$69.00 – $110$84.00Promo
Taille
Color
Designer: George Hamilton Perkins Greenough
La dérive
La Greenough 4-A Single Fin est la simple dérive la plus emblématique, la plus fonctionnelle et la plus polyvalente qui soit, parce qu'elle fonctionne extrêmement bien sur pratiquement tous les types de planches. La 4-A est le pilier de True Ames depuis plus de 40 ans, et elle reste le design de simple dérive le plus populaire qui existe, grâce à ses performances polyvalentes et équilibrées.
Forme | Profil moyen, base pleine associée à un tip effilé et modérément flexible
Fonction | Une dérive qui tient quand vous en avez besoin et qui relâche au bon moment
Sensation | Neutre-positive, parfaitement équilibrée, une dérive qui relance au bottom et répond avec précision dans les turns en arc
En résumé | Polyvalente — conçue pour toutes les formes de planches et toutes les conditions
Spécifications
ConstructionFibre de verre pleine
Tailles6.5 – 10.5
Coloris9 options
Fourchette de prix$69.00 – $110
DisponibilitéEn stock
La fiche technique
Dimensions, caractère et planches compatibles en un coup d'œil.
Toucher pour agrandir
Measurements & Sizing
Every 4A size with its measurements and the boards it suits. Rule of thumb: 1 inch of fin per foot of board, rounded up. For 2+1 setups drop 1.5–2" from your single-fin size — the side bites add hold, so the center fin can be smaller.
| Size | Height | Base | Area | Weight | Boards (single) | Boards (2+1 center) |
|---|---|---|---|---|---|---|
| 6.5" | 6.49" | 5.42" | 22.86 sq in | 227g | 5'6" – 6'6" | 6'0" – 7'0" |
| 7.0" | 7.09" | 5.67" | 24.89 sq in | ~255g | 6'0" – 7'0" | 7'0" – 8'0" |
| 7.5" | 7.55" | 5.95" | 26.86 sq in | ~280g | 6'6" – 7'6" | 8'0" – 9'0" |
| 8.0" | 8.11" | 6.09" | 28.85 sq in | ~305g | 7'0" – 8'0" | 8'0" – 9'6" |
| 8.5" | 8.51" | 6.42" | 32.19 sq in | ~330g | 7'6" – 8'6" | 9'0" – 10'0" |
| 9.0" | 9.14" | 6.93" | 36.13 sq in | ~355g | 8'0" – 9'0" | 9'6"+ |
| 9.75" | 9.71" | 7.09" | 39.93 sq in | ~380g | 8'6" – 9'6" | — |
| 10.0" | 10.08" | 7.42" | 43.85 sq in | ~400g | 9'0" – 10'0" | — |
| 10.5" | 10.63" | 7.91" | 48.44 sq in | 425g | 9'6"+ | — |
Size up if you're over 200 lbs, riding a narrow-tailed board, or surfing overhead+ waves. Size down for wide tails, small gutless surf, or if you want a looser feel. For 2+1 setups: the larger your side bites, the smaller the center fin can be.
Détails techniques
Des caractéristiques qu'aucun autre revendeur ne publie.
RAKE~33–35°
Moderate-to-heavy. More swept than a pivot fin (~28°), less than a hatchet (~40°).
Foil50/50 symétrique
Industry standard for all single fins — equal shape on both sides for balanced rail-to-rail performance.
Boîtier de dériveBoîtier US standard pour longboard (fente de 10.75")
Screw + plate. Does NOT fit Futures or FCS boxes. For 2+1 setups, buy the 2+1 Combo pack.
ConstructionFibre de verre E-glass pleine, âme bois
Matte finish. Volan version uses hand-laid volan cloth with raw finish — flex from the body, not just the tip.
Origine du templateGeorge Greenough, ~années 60
Inspired by bluefin tuna caudal fins. High-aspect-ratio design that launched the shortboard revolution.
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Pourquoi le Volan ?
Volan is a woven fiberglass cloth laid by hand and finished with a resin that cures to a warm amber tint. It flexes differently than solid fiberglass — more spring, more life, more feel through turns. Where solid glass is stiff and direct, volan breathes with the wave.
The hand-laid process means each fin has subtle texture and character. It's heavier, which adds momentum through flat sections. Surfers who ride volan describe it as "warmer" — the fin does more of the work, trimming and holding without demanding constant input.
Shop the True Ames Greenough 4A Single Fin dérive de surf Volan ›
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Ce qu'on en dit
The most iconic, functional, and versatile single fin available.
The right fin for most mid-lengths, eggs, and any single-fin log where carving matters more than parking on the nose — the template you end up measuring every other single against. It wakes a board up: real drive off the bottom, a long held arc through the turn, then a clean release. Go volan for flex through the whole fin on a heavier board, and go 4C instead if your priority is noseriding and tight pivots.
EN SAVOIR PLUS SUR CETTE DÉRIVE
The Greenough 4A is a single fin designed by George Greenough, made by True Ames, with a full base, long swept rake, tapering tip with moderate flex, and a symmetrical foil. Greenough drew the outline from the tails of tuna and dolphins. It comes in sizes from 6.5" to 10.5": 6.5"-8.5" for shortboard single fins and 2+1 boards, 7.5"-9" for speed shapes and mid-lengths, and 9"-10.5" for single-fin longboards. A volan version is also offered, which carries flex deeper through the body of the fin.
$69.00 – $110