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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. The modular design has remained fundamentally unchanged since the original patent was filed by Andrew Ritchie in 1979,〔(【引用サイトリンク】title=EP19790302096: Folding Bicycle )〕 with small details being refined by continual improvement. Ritchie was awarded the 2009 Prince Philip Designers Prize for work on the bicycle.〔 〕 In reviews of folding bicycles, the Brompton is often the winner.〔 〕〔 〕 Brompton is the largest volume bicycle manufacturer in Britain. Approximately 22,000 bicycles are produced by the company each year, of which 70 percent are exported.〔 == Design == All Brompton folding bicycle models share the same curved frame, consisting of a hinged main tube, pivoting rear triangle, fork, and hinged handle-bar stem. The main tube and stem are made of steel in all models. The rear triangle and fork are either steel or titanium, depending on model. The steel sections are joined by brazing – not welding. Wheels are rim size, carrying tyres with 16″ tread diameter. The handlebars and some peripheral components are aluminium. A Brompton bicycle uses over 1,200 individual pieces, 80% of which are manufactured solely for the Brompton design. the combinations allow one-, two-, three-, or six-speed gearing options to be factory-fitted, with higher or lower gearing available as an option. The Brompton uses a combined rear fold and suspension design. During riding, the rear triangle rests on a rubber spring to provide suspension between the rear wheel and the main frame supporting the rider. The suspension block is kept in compression by the rider's weight. A factory-fitted firm suspension block is offered as an alternative to the standard block for heavier riders or those wanting a more responsive ride. There is no suspension for the front wheel, although the titanium forks of the Superlight versions provide a small amount of spring. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Brompton Bicycle」の詳細全文を読む スポンサード リンク
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