The size of the bicycle tyre phyletic and confusing. Worse, in the early stage, each country according to oneself
The size of a nominal system manufacturing bicycle. These different countries size nominal methods caused such a situation, namely
The same size of tyres in different countries have different digital identification. The most troublesome situation are not interchangeable use the phase
With the size of the tire often have the same number identification!
2 / traditional size system
According to the size of the traditional system for measuring the outer tire. This method is often in inches for unit (26 ", and "etc
Etc), or with centimetres (650,700, etc.).
Unfortunately the tyres and circle the development of measurement method not tally with the actual situation. Let us look for? Why
X: 26 will in late 30's is a heavy "balloon tire (ballon trucks)" the most popular sizes, the bicycle
Until today, the size of the beach in "cruiser)" uh cruiser (this car is also common. The size of the wheel
The actual diameter tyres and 26 inches very close. However, some of this kind of tyre is not satisfied with the rider, they want more light faster
The tires. Then industry will create a "medium", its nominal size for the tyres, 26 (1.75 can apply the same circle
. Although they are called "26 inches," but the real size is the tyres May 25, rather than 8 inch / 26 inches. The same
The size of the circle by west klunker pioneers, and became a mountain bike. In the market, you can
Find the mm with the tire that narrow circle, and the use of 26 inches tire its actual size is almost 24 July/August.
The second Numbers or letters that the width of the tire coding (26, 27 x x 1.75 1 1/4 650B, 700C...).
3 / "0.75" mean "three-quarters"?
Please note the nominal sometimes use of inches width (26 (decimal said), and sometimes use 1.75 score (26 (1)
3/4). This is the most common cause of don't match. Although the nominal size in mathematics is equal, but they are
Are different sizes of tires, this is not swap. Want to summarizes the characteristics of tire dimensions is suspended,
But I have confidence to put forward the following rules:
The brown tire dimensions:
If two tyre mark in math equal size, and use a decimal another use of the score, then the two
A tyre can exchange use.
Sometimes the tyre manufacturers in this issue even made many. Especially in some European model also mark the wrong, they should make
In decimal nominal but mistakenly used scores.
4 / size of fraud
Competition often leads to broadband measurement error. The following reasons: if you are the market for high-performance 700 x 25 tires, you might through the investigation and the catalogue manual light 700-25. If the Pepsi company and delicious tire company tires have the same quality and technology, but PepsiCo 700-25 tire is actually 700-24 tyres for 25, so only nominal the Pepsi than Coca-Cola company real nominal 700-25 more light. PepsiCo has such a competitive advantage. In order to prevent the Coca-Cola company and they will be even more light 700-23 logo for the 700-25.
This situation in the 1970s and 1980s, later development to unmanageable, hence again return precise width
Measurement of the trend (but not very common).
5 / ISO (E.T.R.T.O.) system:
The international organization for standardization (ISO) established a set of common tyres, in order to eliminate all kinds of size system. This system had been called "E.T.R.T.O" system, is the technology of European tires and wheel rims European Organization (in) with needed and Rim.
ISO system using two Numbers. The first is the width of the circle, tires, or in millimeters. According to the actual broadband tire (the width of the circle is a little change of the width of the measurement is. Circle circle of the distance between the edge.
The second ISO digital is a key figure, is the diameter of the circle hub, the unit is mm. Generally speaking, if the number is same, tires, can install to circle, If the number of different, tire Ann doesn't go up.
For example, a 700 * public road tires for 20 - the ISO nominal geotechnics, A mixture of 700-38 womb for the ISO nominal 38-622. The width of these differences tyres doesn't suit exchange use, but any suitable one circle of tires with other models can also use the tyres.
The following is a list of common tradition on the part of the American tire dimensions and their ISO wheel size.
Scores of size:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Scores of ISO system
28 x 1 1/2... 635 mm
27 x're... 630 mm
26 x 1 (650C)... 571 mm
26 x 1 1/4... 1107 mm
26 x 1 3/8 (S - 6)... 1107 mm
26 x 1 3/8 E.A. (3). 590 mm
26 x 1 1/2 (650B)... 8.05 mm
26 x 1 (650C)... 571 mm
26 x 1 1/2 (F).
26 x 1 3/4 (S) - 7.
24 x 1... 520 mm
24 x 1 1/8... 520 mm or540 mm!
24 x 1 1/4... 547 mm
24 January 3 x 5-8 (S)... 547 mm
24 January 3 x 5-8 (E)... 540 mm
20 x 1 1/8
20 x 1 1/4
20 x 1 3/8... 451 mm
20 x 1 3/4... 419 mm
V17 x 1 1/4... 369 mm
16 x 1 3/8... 349 mm
16 x 1 3/8... 337 mm
16 x 1 3/8... 335 mm
16 x 1 3/4... 317 mm
12 1/2 x're... 203 mm
10 x 2... 152 mm
8 x 1 1/4... 137 mm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Traditionally, scores of wheel rims are straight edge (on).so staight - sided. High-performance size (571 mm / 26
X 1 & 630 mm / 27 ") has been developing for dao (rims) edged - hooks.
The decimal size:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
The decimal ISO
26 x 1.00 or 2.3. 559 mm
26 (rare) x 1.25... 599 mm
26 x 1.375... 599 mm
X x 24 1.5-24 will... 507 mm
22 x x, 22 1.75 will... 457 mm
X x 20 1.5-20 will... 406 mm
18 x 1.5... 355 mm
18 x 1.75-18 x will... 355 mm
16-16 x x 1.75 will... 305 mm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Method (countries) system size:
In the legal system and the first number is nominal diameter, unit mm. After the letters with width: "A" is for narrow, "D" is for wide. Now this letter has no longer has a close relation with the tyres width, because the womb for those who are often narrow width shall be installed in the womb circle. For example, 700C was originally a wide tire size, but now has a very narrow, the actual diameter is almost 660mm.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Legal size ISO
700 C... 622 mm
700 D... 587 mm
650 A... 590 mm
650 B... 8.05 mm
650 C... 571 mm
6 A... 540 mm
550 A... 4.9 mm
5 A... 440 mm
45 A... 39 mm
4 A... 340 mm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
ISO comprehensive references:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
ISO traditional nominal
635 mm.. 28 x 1 1/2
630 mm.. 27're x
622 mm.. 700 C
599 mm.. 26 x x 1.25 1.375
1107 mm.. 26 x 1 1/4, 26 January 3 / x 8 (S) - 6.
590 mm.. 26 x 1 3/8 (3), E.A. 650
587 mm.. 700 D
8.05 mm.. 650B, 26 x 1 1/2
571 mm.. 26 x x 1, 26 January 26, 1/2 x 1 3/4, 650 C
559 mm.. X x 1.00-26 will
547 mm.. 24 x 1 1/4, 24 x 1 3/8 (S) -
540 mm.. 24 x 1 1/8, 24 x 1 3/8 (E) 5), 600
520 mm.. 24 x 1, 1, 1 / aug 24 x
507 mm.. X x will 1.5-24
4.9 mm.. 550
457 mm.. 22 x 1.75, X will
451 mm.. 20 x 1 1/8, X 1 1/4, X 1 3/8
440 mm.. 5 A
419 mm.. 20 x 1 3/4
406 mm.. X x will 1.5-20
39 mm.. 45 A
369 mm.. 17 x 1 1/4
355 mm.. 18 x x 1.5 - will
349 mm.. 16 x 1 3/8
340 mm.. 4 A
337 mm.. 16 x 1 3/8
317 mm.. 16 x 1 3/4
305 mm.. X x 1.75-16 will
203 mm.. 12 1/2 X're.
152 mm.. 10 x 2
137 mm.. 8 x 1 1/4
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
6 / width considerations
Although you can practice any use of the same diameter wheel tires/circle "combination", but using the difference is too big
But very unwise. If in a wide circle used on a very narrow tires, may have damaged the risk of leakage and circle. If you are in a narrow circle on the wide use of tire, may have side circle circle or the risk of failure. Unfortunately, the risk is at the edge of the mountain. In order to reduce weight, the circle is too narrow mountain nowadays. This narrow circle with wide tire, unless a very bad breath of filling the tires very full. But it was lost, and the wide circle to the side of the improper pressure exerted.
Georg Boeger friendship provides recommendation width combination form:
The tires and circle diameter of all safety matching [with unit of millimeter]
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| tires width
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
18 20 | circle width 32 35 25 and 23 37 40 44 47 50 54 57
13... | X.. X.. X.. X...
15... |... X.. X.. X.. X...
17... |... X.. X.. X.. X.. X...
19... |... X.. X.. X.. X.. X.. X...
21... |... X.. X.. X.. X.. X.. X...
23... |... X.. X.. X.. X...
25... |... X.. X.. X.. X.. X.
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