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2. 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]

3. 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.

4. Bicycle wheel - Wikipedia

   en.wikipedia.org/wiki/Bicycle_wheel

   The 650C size has the ISO diameter size of 571 mm. Size 650B is 584 mm and 650A is 590 mm. 650B is being promoted as a 'best of both worlds' size for mountain biking. [41] Most adult mountain bikes use 26 inch wheels. Smaller youth mountain bikes use 24 inch wheels.

5. Glossary of cycling - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_cycling

   27.5 Mountain bike A mountain bike with wheels that are approximately 27.5 inches (700 mm) in diameter and are based on ISO 584 mm (650B) rims. 29er (bicycle) A mountain bike with wheels that are approximately 29 inches (740 mm) in diameter and are based on ISO 622 mm (700C) rims. [1] [2] 3:1 rule

6. List of bicycle types - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_types

   Mountain bicycle gearing is often very wide-ranging, from very low ratios to mid ratios, typically with 9 to 28 gears, although some riders prefer the mechanical simplicity and ease of maintenance of single-speed mountain bikes. 29ers are mountain bikes that are built to use 700C or ISO 622 mm wheels. 27.5 bikes are mountain bikes that are ...

7. ISO 5775 - Wikipedia

   en.wikipedia.org/wiki/ISO_5775

   ISO 5775 is an international standard for labeling the size of bicycle tires and rims. The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO). It is designed to make tire sizing consistent and clear. It replaces overlapping informal systems that ambiguously distinguished between sizes.