22/05/2026
【New Old Stock 】Carbon Dry Japan (CDJ) Carbon Fiber S-Stem for Brompton (Brand New / Actual Weight: 322g)
$25000HKD
This is an exceedingly rare, discontinued dry carbon fiber S-Stem for Brompton bicycles, manufactured in limited quantities years ago by the Japanese composite specialist Carbon Dry Japan (CDJ). This item is in Brand New / New Old Stock (NOS) condition. It is highly probable that this is the last remaining uninstalled, brand-new CDJ S-Stem in the world.
For elite Brompton builders chasing the sub-5kg or sub-4kg dream, you already know the ultimate truth of bike modification: once you reach a certain threshold, shaving off even 10 grams feels like moving mountains.What if you could drop a massive chunk of weight from the most critical part of your cockpit while maintaining absolute racing rigidity?
What does 322g mean?
Stock Steel S-Stem: ~800g – 900g
Titanium Stems: ~420g – 460g
This Discontinued CDJ S-Stem: 322g!
Replacing your stock stem shaves off over half a kilogram (500g+) instantly. In the world of weight-weenies, a 100g saving on a single structural component is a legendary leap that separates a standard build from a world-record masterpiece.
【全新絕版 】日本 Carbon Dry Japan (CDJ) 乾碳纖維小布 S形頭管 (全新未裝車 / 實秤 322g)
$25000HKD
全新絕版收藏品，外觀與結構保存完美。碳纖維管身無裂痕或白化，金屬關節接縫處與黑化陽極層皆完整無瑕。詳細狀態請參考實物照片。
日本高階碳纖維製造商 Carbon Dry Japan (CDJ) 早期針對 Brompton 少量製作的乾碳纖維 S形頭管（S-Stem）。本品為全新未使用狀態，極大機會是全球僅存最後一支全新未裝車的 CDJ S形頭管。
對於正在挑戰整車 5 公斤、甚至 4 公斤以下極限的 Brompton 頂級玩家來說，您一定深知一個改裝鐵律：當整車重量降到一定程度後，每想再偷輕 10g，付出的代價與難度都是幾何級數上升。
而現在，有一個機會能讓您的愛車在最核心的座艙大件上，瞬間暴瘦、直擊力學極限。
摧毀性的數據對比：322g 究竟是什麼概念？
原廠鋼製 S 頭管：約 800g – 900g
目前市面主流 鈦合金頭管：約 420g – 460g
本款日本 CDJ 絕版 S 頭管：僅 322g！
這意味著，換上這支頭管，您不僅能比原廠鋼管直接砍掉半公斤（500g+）的重量！ 在輕量化的金字塔頂端，這 100g 的差距就是決定您的作品是「常規輕量化」，還是能登頂「全球輕量化名人堂」的決定性關鍵。
Star Track Cycle
+852 63380856
Shop G08B, My Loft, 9 Hoi Wing Rd, Tuen Mun
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www.startrackcycle.com
