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2. Tire code - Wikipedia

   en.wikipedia.org/wiki/Tire_code

   Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [24] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.

3. ISO 5775 - Wikipedia

   en.wikipedia.org/wiki/ISO_5775

   The overall diameter of the tire is then the rim diameter plus twice the tire's section height. The ISO 5775-1 standard also defines procedures for measuring tires and for calculating from the marking the maximum dimensions of a tire, which are needed by designers to determine clearance distances to other bicycle components.

4. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   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 expressed as a percentage of the nominal tire width.

5. Plus sizing - Wikipedia

   en.wikipedia.org/wiki/Plus_sizing

   Plus sizing is the practice of replacing an automotive wheel with one of a larger diameter fitted with a new tire of lower aspect ratio so that the new tire has close to the same diameter and circumference as the original tire to minimize any changes in speedometer accuracy, torque and traction control, while reducing sidewall flex and (generally) increasing cornering ability.

6. 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]

7. Formula One tyres - Wikipedia

   en.wikipedia.org/wiki/Formula_One_tyres

   For the 1981 season the maximum diameter of the rear tyre was limited to 26.0", while the diameter of the front tyres was increased. Therefore, from 1981 until 1992, Goodyear supplied white sidewall marked Eagle tyres with the sizes of 25.0"×10.0"–13" in the front and 26.0"×15.0"–13" in the rear. [6]