H&H Stem Catch Mount for Brompton Bicycle G Line

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.