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2. Bicycle frame - Wikipedia

   en.wikipedia.org/wiki/Bicycle_frame

   The 'diamond' frame's central, horizontal top bar forces the rider to swing a leg over the bicycle's seat. A Triumph step-through, ladies', or open frame Dursley Pedersen bicycle circa 1910 A penny-farthing photographed in the Škoda Auto Museum in the Czech Republic A Brompton folding bicycle Bicycle in Victorian Plymouth, England, with a predecessor of the Starley diamond-frame A cantilever ...

3. Safety bicycle - Wikipedia

   en.wikipedia.org/wiki/Safety_bicycle

   The most popular form of the safety bicycle frame, consisting of two triangles, is known as a diamond frame. A similar but different frame used in safety bicycles is the step-through frame. Despite the enormous variety of modern bicycles, recumbent bicycles are the only major variety of bicycle which do not use this same basic design.

4. Moulton Bicycle - Wikipedia

   en.wikipedia.org/wiki/Moulton_Bicycle

   A 1965/66 Moulton 'New Look' Standard M1. In the late 1950s, disillusioned with the design of the classic bicycle, Alex Moulton set about creating a new design. He thought the classic diamond frame was inconvenient to mount, difficult to adjust for size and not suitable for both sexes, and that 'Ladies' open frame bicycles without the top tube of the diamond frame were structurally compromised ...

5. History of the bicycle - Wikipedia

   en.wikipedia.org/wiki/History_of_the_bicycle

   The pneumatic tire made all of these obsolete, and frame designers found a diamond pattern to be the strongest and most efficient design. On 10 October 1899, Isaac R Johnson, an African-American inventor, lodged his patent for a folding bicycle – the first with a recognisably modern diamond frame, the pattern still used in 21st-century ...

6. Diamondback Bicycles - Wikipedia

   en.wikipedia.org/wiki/Diamondback_Bicycles

   Diamondback Bicycles was founded as a BMX brand in 1977 by Western States Imports in Newbury Park, California, which sold bikes under the Centurion (bicycle) brand. [1] Early in its history, the brand name was "Diamond Back" and in 1994 this changed to "DiamondBack" and then to "Diamondback."

7. Bicycle - Wikipedia

   en.wikipedia.org/wiki/Bicycle

   A bicycle, also called a pedal cycle, bike, push-bike or cycle, is a human-powered or motor-assisted, pedal-driven, single-track vehicle, with two wheels attached to a frame, one behind the other. A bicycle rider is called a cyclist, or bicyclist. Bicycles were introduced in the 19th century in Europe. By the early 21st century there were more ...