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2. 29er (bicycle) - Wikipedia

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

   29″ and 26″ mountain bike wheels. 29er rims have an interior diameter of 622 millimetres (24.5 in) [1] and the average 29″ mountain bike tire is (in ISO notation) 59-622 – corresponding to an outside diameter of about 29.15 inches (740 mm). The typical 26″ MTB tire has a rim diameter of 559 millimetres (22.0 in) and an outside tire ...

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. [3] [8] [11]

4. 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.

5. Mountain bike - Wikipedia

   en.wikipedia.org/wiki/Mountain_bike

   A mountain bike with 29″ wheels is often referred to as a 29er, and a bike with 27.5-inch wheels is called a 27.5 Mountain bike or as a marketing term ″650B bike". [ 27 ] Wheels come in a variety of widths, ranging from standard rims suitable for use with tires in the 1.90 to 2.10 in (48 to 53 mm ) size, to 2.35 and 3.00 in (60 and 76 mm ...

6. Gear inches - Wikipedia

   en.wikipedia.org/wiki/Gear_inches

   For example, consider a 700c × 23 mm tire, which has a nominal cross-section of 23 mm. 700c wheels have a rim diameter of 622 mm. Hence the wheel diameter is (2 × 23 mm) + 622 mm = 668 mm which is equal to 26.3 inches (rounded to 1 decimal place). 26 inch mountain bicycle wheels have a rim diameter of 559 mm. This ignores factors that ...

7. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   Example of tire sizing on an all-terrain vehicle. Modern road tires have several measurements associated with their size as specified by tire codes like 225/70R14. The first number in the code (e.g., "225") represents the nominal tire width in millimeters. This is followed by the aspect ratio (e.g.,"70"), which is the height of the sidewall ...