G Line 頭管波波頭是專為 Brompton G Line 車系設計的折疊固定升級配件，用以穩定頭管於折疊後的位置，避免外凸影響攜帶與存放。相較原廠塑膠止擋件易變形的狀況，此款升級版採用 CNC 鋁合金本體、雙墊片設計與一只鈦螺絲構成，使用者可自行微調安裝位置，實現更緊密的折疊結構。 實測可有效減少約 20mm 的整體折疊寬度，不僅提升收納效率，也增添整車俐落感。
The G-Line Stem Catch Mount is an upgraded folding-position stabilizer specifically designed for Brompton G Line models. It secures the head tube in the folded position, preventing outward protrusion that can affect portability and storage. Compared to the original plastic stopper—which is prone to deformation over time—this upgrade features a CNC-machined aluminum body, two adjustable spacers, and a titanium bolt. The mount allows users to fine-tune the installation position for a tighter and more compact fold. Tests show a reduction of approximately 20mm in total folded width, improving storage efficiency and enhancing the overall appearance of the bike.
