Brompton Bicycle is a manufacturer of folding bicycles based in Brentford, London.The Brompton folding bicycle and accessories are the company's core product, noted for its self-supporting compact size when stored. All available models of the folding bicycle are based on the same hinged bicycle frame and 16 inch (37×349 mm) bicycle wheel tyre size. Components are added, removed, or replaced by titanium parts to form the many variations.