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Strida EVO (3-speed version with Sturmey Archer kickback bottom bracket, available in 16" and 18" versions, both with the SX's improved rack and pedals.) A number of unlicensed copies of Strida are manufactured in several countries (China, Thailand), and are sold with names such as "Folding bike Strida" or STRDA. [23]
A folding bicycle can be quickly folded for easy carrying, for example on public transport. A small wheel bicycle, such as a Moulton Bicycle, has a traditional seating position and small wheels. A portable bicycle, such as a Strida, is a folding bicycle that is small and light enough to be easily carried afoot or in a cramped vehicle.
Instead of folding horizontally, this style of bike has one or two hinges along the main tube and/or chain and seat stays that allow the bike to fold vertically. The result leaves the two wheels side by side but is often more compact than a horizontally hinged design. The Brompton and Dahon Qix D8 both feature vertical folding. Triangle hinge
The bottom bracket forms part of the folding rear triangle, and as a result the bottom bracket to rear fork-end distance remains constant throughout the fold. This keeps the chain tension constant, which is an advantage when the Swift frame is used in a fixed-gear, single speed, or hub gear bicycle.
In a review, the Picnica folding mechanism was described as a "case of the frame collapsing backwards on itself, with the handlebars and seat post falling to the top of the rear wheel. To this end, the main part of the frame is a quadrilateral with a pivot at each corner, and a rear triangle made collapsible by hinged seat stays.
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When the design was released in 1962, it was one of the first major innovations in bicycle design since the "safety bicycle" in the 1880s and made an immediate impact.The 1962 version (aka "bicycle of the future") was the first production Moulton bicycle with suspension and the racing version was televised the same year, ridden by road race champion and Moulton employee John Ronald Tovey.
Brompton Bicycle Limited, trading as Brompton, is a British manufacturer of folding bicycles based in Greenford, London. [6]The Brompton folding bicycle and accessories are the company's core product, noted for its self-supporting compact size when stored.