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2. Folding bicycle - Wikipedia

   en.wikipedia.org/wiki/Folding_bicycle

   Bike Friday offers a model, the Tikit, featuring a cable-activated folding mechanism requiring no quick releases or latches, for increased folding speed. 1960s European folding bicycle, showing hinged frame and quick release handlebar stem allowing the bars to turn parallel to the frame when folded. Magnet folding and suspension system

3. Bicycle performance - Wikipedia

   en.wikipedia.org/wiki/Bicycle_performance

   Usually this is assumed to be independent of (speed of the bicycle on the road) although it is recognized that it increases with speed. Measurements on a roller-mechanism give low-speed coefficients of 0.003 to 0.006 for a variety of tires inflated to their maximum recommended pressures, increasing about 50% at 10 m/s. [21]

4. List of bicycle types - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_types

   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.

5. Swift Folder - Wikipedia

   en.wikipedia.org/wiki/Swift_Folder

   The Swift Folder design employs a vertical folding method, using the seat-post and a split seat-tube as the locking mechanism. To fold, the seat-post is released from the two parts of the seat-tube by their respective quick release clamps, then pulled up into the upper part of the seat-tube to unlock the frame. A pivot in the main frame tube then allows the rear triangl

6. Birdy (bicycle) - Wikipedia

   en.wikipedia.org/wiki/Birdy_(bicycle)

   Mark 1 Birdy folding bike from 2000, with 7 speed dérailleur The Birdy's dimensions are small enough to take into offices, on buses, and to pack for travelling. It is the second smallest of the quality folding bikes (behind the Brompton), and is similar in size to the Mezzo performance folder: Width: 35 to 39 cm (13.8 to 15.4 in) Height: 58 to ...

7. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   One standard option for the Brompton folding bicycle is to use a 3-speed hub gear (roughly a 30% difference between gear ratios) in combination with a 2-speed derailleur gear (roughly a 15% difference) to give 6 distinct gear ratios; this is an example of half-step gearing. Some Brompton suppliers offer a 2-speed chainring 'Mountain Drive' as ...