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2. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   Wheels with Asanti 28 in (710 mm) rims on a police Hummer H2 car. The wheel size is the size designation of a wheel given by its diameter, width, and offset. The diameter of the wheel is the diameter of the cylindrical surface on which the tire bead rides. The width is the inside distance between the bead seat faces.

3. ISO 5775 - Wikipedia

   en.wikipedia.org/wiki/ISO_5775

   The rim type codes SS or HB precede the rim designation, whereas code C is appended to the nominal width. Examples: SS 400×20, HB 422×25, 620×13C. The nominal width of a rim is the inner width between the straight sides or beads as one can easily measure it with a caliper (see the standard for drawings and exact measurement procedures).

4. Rim (wheel) - Wikipedia

   en.wikipedia.org/wiki/Rim_(wheel)

   A distance between the bead seats (for the tire), as measured in the plane of the rim and through the axis of the hub which is or will be attached, or which is integral with the rim. Width (effective) A separation distance between opposed rim flanges. The flange-to-flange width of a rim should be a minimum of three-quarters of the tire section ...

5. Tire code - Wikipedia

   en.wikipedia.org/wiki/Tire_code

   The actual diameter of a specific tire size can only be found in the TRA Yearbook or the manufacturer's data books. [23] Note that the tire's cross-section and diameter are always specified when measured on a rim of a specified width; different widths will yield different tire dimensions.

6. 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.

7. 29er (bicycle) - Wikipedia

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

   Larger wheels roll over obstacles more easily. The ability of a wheel to roll over obstacles is proportional to its size. A 29″ wheel, which is about 10% larger than a 26″ wheel, can roll over 10% larger obstacles. [citation needed] The larger diameter wheels have more angular momentum so they lose less speed to obstacles and rough sections.