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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]
The inner width of the rim on which the tire is mounted should be about 65% of the tire's nominal section width for tires smaller than 30 mm and 55% for those larger. The section height of a tire is usually identical to its section width (for tires less than 28 mm, 2.5 mm have to be added to the width to get the height).
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 ...
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).
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 ...
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The average 29-inch mountain bike tire is ISO 59-622 - corresponding to an outside diameter of about 29.15 inches (740 mm). 32 inch / ISO 686. 32-inch wheels have been in use on unicycles and have been appropriated for bicycles to create bikes more proportional for taller riders. [39] 36 inch / ISO 787
The European Tyre and Rim Technical Organisation (ETRTO) exists to specify and harmonise sizes of rims and their associated pneumatic tyres across the European Union.ETRTO sizes apply to rims and tyres for vehicles of all types, including bicycles.