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2. Unicycle - Wikipedia

   en.wikipedia.org/wiki/Unicycle

   These unicycles are used similarly to flatland bicycles. Wheel size is usually 20 inches (510 mm), but smaller riders may use 16-or-12-inch (410 or 300 mm) unicycles. Some people prefer 24-inch (610 mm) wheels. Many freestyle unicyclists will use white tires to avoid tire marks when riding indoors.

3. History of the bicycle - Wikipedia

   en.wikipedia.org/wiki/History_of_the_bicycle

   BMX bikes are specially designed bicycles that usually have 16 to 24-inch wheels (the norm being the 20-inch wheel), which originated in the state of California in the early 1970s when teenagers imitated their motocross heroes on their bicycles. [69] Children were racing standard road bikes off-road, around purpose-built tracks in the ...

4. List of bicycle types - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_types

   A bamboo bicycle has a frame made of bamboo. A cardboard bicycle is made of cardboard. A lugged steel bicycle has a frame made of steel. A plastic bicycle was an attempt in the early 1980s to introduce a bicycle made entirely out of plastic materials instead of metal. A wooden bicycle has a frame made out of wood.

5. Bicycle wheel - Wikipedia

   en.wikipedia.org/wiki/Bicycle_wheel

   24-inch clincher tires (with inner tubes) are the most common wheel size for junior mountain bikes. The typical 24-inch rim has a diameter of 507 millimetres (20.0 in) and an outside tire diameter of about 24 inches (610 mm).

6. Small-wheel bicycle - Wikipedia

   en.wikipedia.org/wiki/Small-wheel_bicycle

   Small-wheel bicycle. Small-wheel bicycles are adult bicycles that have wheels of 510 mm (20 in) nominal diameter or less, which is smaller than the 700c (522 mm), 660, 700, 740 mm (26, 27.5, 29 in) sizes common on most full-sized adult bikes. While many folding bicycles are small-wheel bicycles, not all small-wheel bicycles can fold.

7. Magna (bicycle company) - Wikipedia

   en.wikipedia.org/wiki/Magna_(bicycle_company)

   In 1999, Dynacraft voluntarily recalled about 3,000 Magna "Great Divide" 21 speed mountain bikes, sold in the 24-inch size for girls and boys, and the 26-inch size for women and men. The bikes could have defective handle bar stems which would not tighten sufficiently to lock onto the bicycles.