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2. 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.

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. Bicycle wheel - Wikipedia

   en.wikipedia.org/wiki/Bicycle_wheel

   The average 29-inch mountain bike tire is ISO 59-622 - corresponding to an outside diameter of about 29.15 inches (740 mm). 32 inch / ISO 686. 32-inch wheels have been in use on unicycles and have been appropriated for bicycles to create bikes more proportional for taller riders. [39] 36 inch / ISO 787

5. 29er (bicycle) - Wikipedia

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

   The 650B size, also known as 27.5″, reappeared in 2007 [6] as a compromise between the 26 inch and 29 inch sizes. The 650B size is called 27.5″. [7] The name "29er" comes from a bicycle called the Two Niner, which was offered by the Fisher bike company in 2001, according to 1998 Mountain Bike Hall of Fame inductee Don Cook. [8]

6. Fixed-gear bicycle - Wikipedia

   en.wikipedia.org/wiki/Fixed-gear_bicycle

   A fixed-gear bicycle. An 18-tooth sprocket that attaches to the rear hub of fixed-gear bike. Track sprockets are typically attached and removed from the hub by screwing them with a chain whip. This tool incorporates a lockring spanner for securing a reverse threaded lockring against the sprocket. A fixed-gear bicycle (or fixed-wheel bicycle in ...

7. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   A bicycle gearbox with chain tensioner. Bicycle gearing is the aspect of a bicycle drivetrain that determines the relation between the cadence, the rate at which the rider pedals, and the rate at which the drive wheel turns. On some bicycles there is only one gear and, therefore, the gear ratio is fixed, but most modern bicycles have multiple ...