Bicycle tire rim size standard

1, tire size and rim size fit

Many types of bicycle tire size and confusing. Worse, in the early stages of each country according to their own

The nominal size of a system of manufacturing bicycles. The nominal dimensions of these methods in different countries caused such a situation in which

The same size tires in different countries have different digital identities. The most troublesome situation is not interchangeable with non-use

Often the same size tires with the same digital identity!

2, the traditional sizing system

The traditional system is based on the measurement of the size of the tire diameter. This approach is usually in inches (26 ", 27" and so on

Etc.), or in centimeters (650, 700, etc.). 1

Unfortunately, the development of the tire and rim makes this method of measurement is no longer realistic. Let us take an example to see why

: 26 × 2.125 in the late 1930s is a heavy duty "balloon tires (ballon tire)" bike most popular size, when

Today to tire in this size "beach cruiser (beach cruiser)" This car is also very common. This size wheel

Actual tire diameter and 26 inches are very close. However, some riders and the tires are not satisfied with this, they want lighter and faster

Tires. So the manufacturing industry on a "medium-sized" tire with a nominal size of 26 × 1.75, can be applied to the same kind of rims

. Although they are still called "26 inches", but the real size of these tires is 25 5/8 inches instead of 26 inches. the same 

The rim size is also the west coast klunker pioneers adopted and became the standard mountain bike. In the market, you can

So find 25mm narrow tires with rims that use, and this 26-inch tires actual size is almost 24 7/8.