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Both are measured in millimeters. A typical example of a tire marking according to ISO 5775-1 is: 32-597 inflate to 400 kPa. The first number (nominal section width) is essentially the width of the inflated tire (minus any tread). The second number (nominal rim diameter) is the inner diameter of the tire when it is mounted on the rim.
For example, wheels for road bicycles are often referred to as 700C, when they actually measure 622 mm. [1] Wheel diameters and widths for cars are stated in inches, while car tire bead diameters are stated in inches and widths are in millimetres.
Their rim diameter of 622 millimetres (24 + 1 ⁄ 2 in) is identical to most road, hybrid, and touring bicycle wheels, but they are typically reinforced for greater durability in off-road riding. 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
Due to front fork suspension, modern mountain bikes—as opposed to road bikes—tend to have slacker head tube angles, generally around 70°, although they can be as low as 62° (depending on frame geometry setting). [3] At least one manufacturer, Cane Creek, offers an after-market threadless headset that enables changing the head angle. [4]
29ers or two-niners are mountain bikes and hybrid bikes that are built to use 700c or 622 mm ISO (inside rim diameter) wheels, commonly called 29″ wheels. [1] Most mountain bikes once used ISO 559 mm wheels, commonly called 26″ wheels. The ISO 622 mm wheel is typically also used for road-racing, trekking, cyclo-cross, touring and hybrid ...
It has been called "Raleigh Pattern" and "Westrick". They are noted for their strength, and there is also a Schwinn Bicycle Company copy of this design. [3] Westwood profile rims are most commonly seen in sizes 635 mm (28 in × 1 + 1 ⁄ 2 in or 711 mm × 38 mm), also marked 700 B, [3] but they are made in most of the middleweight sizes of:
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.
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 ...
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