What is the circumference of a bicycle wheel? What about the interview? What is the actual circumference? The actual area is?
Unfortunately, the development of tires and rims makes this measurement method no longer realistic. Let us take a look at why: 26 × 2.125 in the late 1930s is a heavy "balloon" (ballontire) "the most popular size of the bike, today the size of the tire in the" beach cruiser (beachcruiser) "this car Is also very common. The size of the tire is actually close to the actual diameter of 26 inches. However, some riders are not satisfied with the tires, they want lighter and faster tires. So the industry to create a "medium" tires, the nominal size of 26 × 1.75, can be applied to the same kind of car ring. Although they are still called "26", but the real size of these tires is 255/8 inch, rather than 26 inches. The same size of the rim was also adopted by the klunker pioneers on the west coast and became the standard for mountain bikes. In the market, you can find 25mm tires with the use of such a circle, and this 26-inch tires its actual size is almost 247/8.
The traditional size system is based on the measurement of tire outside diameter. This approach is usually in inches (26 ", 27", etc.), or in centimeters (650,700, etc.). The
The size of the bicycle tires is varied and confusing. Worse, at an early stage, each country makes bicycles in accordance with its own set of nominal systems. The dimensions of these different countries have created a situation in which the same size tires have different digital identities in different countries. The most troublesome situation is that the non-identical tires are often used to have the same digital logo!
