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2. 29er (bicycle) - Wikipedia

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

   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 diameter of about 26 inches (660 mm). [2]

3. 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.

4. Bicycle wheel - Wikipedia

   en.wikipedia.org/wiki/Bicycle_wheel

   Traditionally, there were four different sizes of 28-inch diameter wheels, from the narrow tires to the widest, they all measured the same outside diameter, which coincide with four different families of 700 tire sizes, these are 700, 700A, 700B and 700C. The largest of these rims (ISO 647mm/642mm) with the narrower tires are no longer available.

5. Gear inches - Wikipedia

   en.wikipedia.org/wiki/Gear_inches

   For bicycles with 700c wheels, some cyclists quote gear inches based on a nominal wheel diameter of 27 inches, corresponding to the old British tire size of 27 x 1 + 1 ⁄ 4" (ETRTO 630). Strictly speaking, the rolling diameter of a 700c wheel may be significantly higher or lower than 27", depending on the tire size, e.g. nearly 27.5" for a ...

6. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   Off-roading tires may use a different measurement scheme: Tread width × Outside diameter, followed by wheel size (all in inches) – for example 31×10.50R15 (787 mm × 267 mm R380 in metric designation). The size of the wheel, however, is denoted as 8.5 in × 20.0 in (220 mm × 510 mm).

7. Bicycle tire - Wikipedia

   en.wikipedia.org/wiki/Bicycle_tire

   A plus-size tire has a width of typically 2.5–3.25 inches (64–83 mm). Three bead seat diameters are available: 559 mm for 26+ , 584 mm for 27.5+ ( 650B+ ), and 622 mm for 29+ . They fill the gap between balloon and fat tires.