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Tire Size
- Jun 01, 2018 -

2/Traditional size system


The traditional size system is based on the measurement of the outer diameter of the tire. This approach is usually in inches (26", 27", etc.), or centimeters (650, 700, etc.).


Unfortunately, the development of tires and rims has made this measurement method no longer practical. Let's take an example to see why: 26×2.125 was the most popular size of a heavy “ballon tire” bike in the late 1930s. Today, this size of tire is on the “beach cruiser”. Kinds of cars are also common. The actual diameter of this size tire is very close to 26 inches. However, some riders are not satisfied with such tires. They want lighter and faster tires. So the industry has created "medium" tires, the nominal size of 26 × 1.75, can apply to the same kind of rim. Although they are still called "26 inches", the true size of these tires is 25 5/8 inches rather than 26 inches. The same rim size was adopted by the klunker pioneers on the West Coast and became the standard for mountain bikes. In the market, you can find tires as narrow as 25mm for use with this type of rim. The actual size of this 26-inch tire is almost 24 7/8.


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