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2. 27.5 mountain bike - Wikipedia

   en.wikipedia.org/wiki/27.5_Mountain_bike

   The wheel size is sometimes erroneously called "650B" [8] [9] as a "marketing term" by some manufacturers for their 27.5", but the 650B size has traditionally been a designation for a 26 inch diameter (ISO ~ 40-584 demi-ballon tire) using the same ISO 584 mm rim [10] used by French tandems, Porteurs and touring bicycles.

3. Bicycle wheel - Wikipedia

   en.wikipedia.org/wiki/Bicycle_wheel

   Disc wheels are designed to minimize aerodynamic drag. A full disc is usually heavier than traditional spoke wheels, and can be difficult to handle when ridden with a cross wind. For this reason, international cycling organizations often ban disc wheels or limit their use to the rear wheel of a bicycle. However, international triathlon ...

4. ISO 5775 - Wikipedia

   en.wikipedia.org/wiki/ISO_5775

   It is designed to make tire sizing consistent and clear. It replaces overlapping informal systems that ambiguously distinguished between sizes. For example, at least 6 different "26 inch" sizes exist (just by American notation), and "27 inch" wheels have a larger diameter than American "28 inch" (French "700C") wheels.

5. 29er (bicycle) - Wikipedia

   en.wikipedia.org/wiki/29er_(bicycle)

   Using the smaller rear wheel allows shorter and quicker handling frames, more options for rear suspension designs and lighter bicycle weight. [23] Another variation is to have a 26″ front wheel with a 29″ rear wheel (commonly called a "69er" though Trek introduced a "69er" in 2007 with a 29″ front wheel and a 26″ rear wheel). [24]

6. Penny-farthing - Wikipedia

   en.wikipedia.org/wiki/Penny-farthing

   The frame is a single tube following the circumference of the front wheel, then diverting to a trailing wheel. A mounting peg is above the rear wheel. The front wheel is in a rigid fork with little if any trail. A spoon brake is usually fitted on the fork crown, operated by a lever from one of the handlebars.

7. Bicycle suspension - Wikipedia

   en.wikipedia.org/wiki/Bicycle_suspension

   His bike, the Gary Fisher RS-1, was released in 1992. Its rear suspension adapted the A-arm suspension design from sports car racing, and was the first four-bar linkage in mountain biking. [12] This design reduced the twin problems of unwanted braking and pedaling input to the rear wheel, but the design wasn't flawless.