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True Ames
True Ames トゥルーアムス グリノー 4A シングルフィン
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)
在庫あり
$69.00 – $110$84.00セール
サイズ
Color
Designer: George Hamilton Perkins Greenough
このフィンについて
Greenough 4-A シングルフィンは、現行のシングルフィンのなかで最も象徴的で、機能的かつ汎用性の高い一本です。ほぼあらゆるタイプのサーフボードで非常によく機能します。4-A は 40年以上にわたり True Ames の主力であり続け、オールラウンドでバランスの取れた性能から、今もシングルフィンのなかで最も広く支持されているデザインです。
形状 | ミディアムプロファイル、フルベースに、先端に向かって細くなる適度にしなやかなティップ
機能 | 必要なときに粘り、ここぞという場面でリリースするフィン
感触 | ニュートラルからややプラス寄りの、バランスの取れた感触。ボトムからドライブし、弧を描くターンでは鋭い反応を示します
総合 | 汎用性が高く、あらゆるボードシェイプとコンディションに向けて設計
スペック
構造ソリッドファイバーグラス
サイズ6.5 – 10.5
カラー9種類
価格帯$69.00 – $110
在庫状況在庫あり
スペックシート
寸法、性格、相性の良いボードを一覧で。
タップで拡大
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.
テクニカル詳細
他店が公開していないスペックまで。
レイク~33–35°
Moderate-to-heavy. More swept than a pivot fin (~28°), less than a hatchet (~40°).
フォイル50/50 シンメトリカル
Industry standard for all single fins — equal shape on both sides for balanced rail-to-rail performance.
フィンボックスUS標準ロングボードボックス(10.75インチスロット)
Screw + plate. Does NOT fit Futures or FCS boxes. For 2+1 setups, buy the 2+1 Combo pack.
構造ソリッドEガラスファイバーグラス、ウッドコア
Matte finish. Volan version uses hand-laid volan cloth with raw finish — flex from the body, not just the tip.
テンプレートの由来ジョージ・グリノー、1960年代頃
Inspired by bluefin tuna caudal fins. High-aspect-ratio design that launched the shortboard revolution.
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ボランとは?
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 トゥルーアムス グリノー 4A シングルフィン Volan ›
レビュー
みんなの声
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.
このフィンについて
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