Cycle Tyre Sizes - a useful cross reference chart
The familiar tyre designations used on bikes describes the outer diameter of the tyre and the nominal tyre width. It says nothing about the size of rim that the tyre will fit on, leading to confusion, as some of the designations relate to more than one rim diameter.
The ETRTO (European Tyre and Rim technical Organisation) developed a standard method for measuring which gives unambiguous tyre sizing. There are two numbers - the first is the width of the tyre in millimeters and the second is the diameter of the rim, also in millimeters.
Examples
- ETRTO 37-622 indicates a tyre width of 37mm and the rim diameter of 622mm
- 28x1.5/8x1.3/8 indicates an approximate outside diameter of 28 inch, the tyre section height of 1.5/8 inch, and the tyre section width of 1.3/8 inch.
- 26x2.10 indicates an outside diameter of 26 inch and a section width of 2.1 inch
An example of the ambiguities in tyre sizing is the rim diameters 559mm (MTB), 571mm (Triathalon) and 590mm (Touring) are all designated 26 inch
If you are replacing an existing tyre on your bike, find the ETRTO number on the sidewall.
We have compiled this cross reference from as many sources as we can find, unfortunately we cannot guarantee it is 100% accurate! We welcome any additional information.
| Nominal |
ETRTO |
British Imperial |
British Modern |
French |
USA |
German |
| 7" |
47-93 |
7x1.3/4 |
|
|
|
|
| 8" |
47-94 |
8x2 |
|
20x47-50 |
|
|
| 50-94 |
|
|
200x50 |
|
|
| 54-110 |
8.1/2x2.1/8 8.1/2x2
|
|
|
|
|
| 32-137 |
8x1.1/4
|
|
|
|
|
| 10" |
54-152 |
10x2 |
|
|
|
|
| 44-194 |
10x1.5/8 |
|
|
|
|
| 11" |
44-222 |
11x1.3/4 - 1.5/8 |
|
|
|
|
| 47-222 |
11x1.3/4 |
|
|
|
|
| 12" |
44-203 |
|
12.1/2x1.75 |
|
|
12.1/2x1.75 |
| 47-203 |
|
12.1/2x1.75x2.1/4
12.1/2x1.90 |
320x57 |
|
12.1/2x1.75x2.1/4 |
| 50-203 |
|
12x2.00
|
|
|
|
| 54-203 |
|
12x1.95
|
|
|
|
| 57-203 |
12.1/2x2.1/4 R |
|
320x57 |
|
|
| 62-203 |
12.1/2x2.1/4 |
|
320x57 |
|
|
| 32-239 |
12.1/2x1.3/8x1.1/4 |
|
300x32A |
|
|
| 57-239 |
12.1/2x2.1/4 |
|
300x55A |
|
|
| 32-248 |
12x1.1/4 |
|
300x32 |
|
|
| 14" |
57-251T |
14.1/2x2.1/4 |
|
315x55 |
|
|
| 47-254 |
|
14x1.75
14x1.90 |
350x32A |
|
|
| 40-279 |
14x1.1/2 |
|
350x38B |
|
|
| 32-288 |
14x1.3/8x1.1/4 |
|
350x32A |
|
|
| 37-288 |
14x1.3/8 14x1.5/8x1.38
|
|
350A
350x37A
350A Confort 350A Demi-Ballon |
|
|
| 40-288 |
14x1.1/2NL 14x1.5/8
|
14x1.75 |
350x38A |
|
|
| 44-288 |
14x1.5/8x1.3/8 |
14x1.75 |
350A 350x42A |
|
|
| 32-298 |
|
14x1.1/4 |
350x32A |
|
|
| 37-298 |
14x1.3/8 Universal |
|
|
|
|
| 16" |
40-305 |
|
16x1.50 |
|
|
|
| 44-305 |
|
16x1.75 |
|
|
|
| 47-305 |
|
16x1.75x2
16x1.90 |
|
16x1.75x2 |
16x1.75x2 |
| 54-305 |
|
16x2 |
400x50 |
|
|
| 47-317 |
16x1.3/4 |
|
|
|
|
| 40-330 |
16x1.1/2 |
|
400x38B |
|
|
| 37-337 |
16x1.3/8ANL |
|
|
|
|
| 28-340 |
|
|
400x30A
|
|
|
| 32-340 |
16x1.3/8x1.1/4 |
|
400A 400x32A |
|
|
| 37-340 |
16x1.3/8
16x1.3/8x1.1/4 |
|
400x35A
400A Confort 400A Demi-Ballon |
|
|
| 44-340 |
16x1.3/8x1.5/8 |
|
400x42A |
|
|
| 25-349 |
16x1 Primo
16x1.1/8 |
|
|
|
|
| 28-349 |
16x1.1/4NL |
|
400X32 |
|
|
| 32-349 |
16x1.3/8 Universal |
|
|
|
|
| 37-349 |
16x1.3/8 Universal |
|
|
|
|
| 17" |
32-357 |
|
|
|
|
17x1.1/4 |
| 32-369 |
17x1.1/4 (Moulton) |
|
|
|
|
| 18" |
28-355 |
18x1.1/8 |
|
|
|
|
| 40-355 |
|
18x1.50
|
|
|
|
| 47-355 |
|
18x1.75x2
18x1.90
|
|
|
|
| 37-387 |
18x1.3/8NL |
|
|
|
|
| 40-387 |
18x1.1/2 |
|
|
|
|
| 28-390 |
18x1.1/8 |
|
450B 450x28A |
|
|
| 32-390 |
18x1.3/8x1.1/4 |
|
450A 450x32A |
|
|
| 37-390 |
18x1.3/8 |
|
450A Confort 450A Demi-Ballon |
|
|
| 55-390 |
|
|
450x55A |
|
|
| 57-390T |
|
|
450x55A
450A |
|
|
| 32-400 |
18x1.1/4 |
|
450x32 |
|
|
| 37-400 |
18x1.3/8 Universal |
|
|
|
|
| 47-440 |
|
18x1.75x2 |
|
|
|
| 20" |
44-400T |
20x1.3/4 |
|
|
|
|
| 36-406 |
|
20x1.50 |
|
20x1.50 |
|
| 37-406 |
20x1.3/8 |
20x1.50 |
|
20x1.50 |
|
| 44-406 |
|
20x1.625 |
|
20x1.625 |
|
| 47-406 |
|
20x1.75 20x1.75x2 |
|
20x1.75 |
|
| 54-406 |
20x2 |
20x2.125 |
500x50 |
20x2.125 |
|
| 57-406 |
|
20x2.125 |
|
|
|
| 47-419 |
20x1.3/4 |
|
|
|
|
| 44-428 |
20x1.5/8 |
|
|
|
|
| 40-432 |
20x1.1/2 |
|
|
|
|
| 32-438 |
20x1.3/8NL |
|
500x32ANL |
|
|
| 37-438 |
20x1.3/8NL |
|
500A |
|
|
| 28-440 |
|
|
500x28A |
|
|
| 32-440 |
20x1.3/8x1.1/4 |
|
500A 500x32A |
|
|
| 37-440 |
|
|
500A Confort
500A Demi-Ballon 500x37A |
|
|
| 40-440 |
20x1.1/2NL |
|
500x38A |
|
|
| 25-451 |
20x1 Primo |
|
|
|
|
| 28-451 |
20x1.1/8 |
|
|
|
|
| 32-451 |
20x1.1/4 |
|
500x32 |
|
|
| 37-451 |
20x1.3/8 Universal |
|
|
|
|
| 22" |
44-484 |
22x1.1/2 |
|
|
|
22x1.5/8-1.1/2 |
| 32-489 |
|
|
550x32ANL |
|
22x1.1/4NL |
| 37-489 |
|
|
|
|
22x1.3/8x1.1/4NL |
| 28-490 |
|
|
550x28A |
|
|
| 32-490 |
22x1.3/8x1.1/4 |
|
550A 550x32A |
|
|
| 37-490 |
22x1.3/8 |
|
550A
550A Confort 550A Demi-Ballon |
|
|
| 32-501 |
22x1.1/4 |
|
550x32 |
|
|
| 37-501 |
22x1.3/8 Universal |
|
|
|
|
| 23" |
47-484 |
23x2 |
|
550x50B |
|
23x2 |
| 54-483 |
|
|
|
|
23x2.25 |
| 24" |
47-501T |
24x1.3/4R |
|
|
|
|
| 37-507 |
|
|
|
24x1.5 |
|
| 47-507 |
24x2x1.3/4 |
24x1.75 24x1.75x2
24x1.85
24x1.90 |
|
24x1.75 |
24x1.75/2 |
| 32-508 |
|
|
|
24x1.5 |
22x1.1/4x1 |
| 25-520 |
24x1 |
|
600x25C |
|
|
| 28-520 |
24x1.1/8 |
|
600x28C |
|
|
| 47-520 |
24x1.3/4 |
|
|
|
|
| 44-531 |
24x1.5/8x1.1/2 |
|
|
|
|
| 35-534 |
24x1.1/2 |
|
600x32B |
|
|
| 37-534 |
24x1.1/2x1.3/4 |
|
600x35B |
|
|
| 40-534 |
24x1.1/2 |
|
600x38B |
|
24x1.1/2 |
| 54-534 |
24x1.1/2x2 25x2 |
|
600x50B 625x50 |
|
|
| 28-541 |
|
|
600x28A |
|
|
32-540 32-541 |
24x1.3/8x1.1/4 24x1.3/8x1.1/4NL |
|
600x32A 600x32ANL |
|
24x1.1/4x1.3/8 |
|
37-541 |
|
|
600A Confort
600A Demi-Ballon 600x35A |
|
24x1.3/8 |
|
40-540 |
24x1.3/8x1.1/2 24x1.3/8 |
|
600x38A |
|
24x1.1/2x1.3/8 |
| 32-547 |
24x1.1/4 |
|
600A |
|
|
| 25" |
37-565 |
25x1.3/8 |
|
|
|
|
| 26" |
32-559 |
|
|
|
26x1.25 |
|
| 37-559 |
26x1.5/8x1.3/8 |
26x1.4 26x1.5 |
|
26x1.5 |
|
| 40-559 |
|
26x1.50
|
|
|
|
| 44-559 |
|
26x1.625 26x1.75 |
|
|
|
| 47-559 |
|
26x1.85 26x1.95 |
|
26x1.75 |
26x1.75x2 |
| 50-559 |
26x2 |
26x2 |
|
26x2 |
|
54-559 54-559T |
26x2 |
26x2.125
26x2.10 |
|
26x2.125 |
|
| 25-571 |
26x1.5/8x1 |
|
650x25C |
|
26x1.75x1 |
| 32-571 |
26x1.5/8x1.1/4 |
|
650x32C |
|
26x1.75x1.1/4 |
| 40-571 |
26x1.3/8x1.1/2NL 26x1.1/2CS |
|
650x35C 650x38C |
|
|
47-571 47-571T |
26x1.3/4 |
|
650x45C 650CSC |
|
|
| 54-571 |
26x2x1.3/4 |
|
650x50C |
|
26x2x1.3/4 |
| 37-584 |
26x1.1/2 26x1.1/2x1.3/8 |
|
650x35B |
|
26x1.3/8x1.1/2 |
| 40-584 |
26x1.5/8x1.1/2 26x1.1/2 |
|
650B Semi-Confort 650x38B |
|
26x1.5 |
| 44-584 |
26x1.1/2x1.5/8 |
|
650B Demi Confort |
|
26x1.5/8x1.1/2 26x1.3/4x1.1/2 |
| 47-584 |
26x1.1/2x1.3/4 |
|
650x45B |
|
|
| 28-590 |
26x1.1/8 26x1.3/8x1.1/8 |
|
650x28A |
|
|
| 32-590 |
26x1.1/4 26x1.3/8x1.1/4 |
|
650x32A |
|
26x1.1/4x1.3/8 |
| 35-590 |
26x1.3/8 |
|
650x35A |
|
|
| 37-590 |
26x1.3/8 |
26x1.375 (Green) |
650A 650x35A |
|
26x1.3/8 |
| 40-590 |
26x1.3/8x1.1/2 |
26x1.50 |
650x38A |
|
26x1.1/2x1.3/8 |
| 32-597 |
26x1.1/4 |
|
|
|
26x1.1/4 |
| 27" |
40-609 |
27x1.1/2 |
|
|
|
|
| 20-630 |
27x.3/4 |
|
|
|
|
| 22-630 |
27x7/8
|
|
|
|
|
| 23-630 |
27x7/8 27x1
|
|
|
|
|
| 25-630 |
27x1
27x1/16 |
|
|
2x71.1/8 |
|
| 28-630 |
27x1.1/8 27x1.1/4fifty |
|
|
27x1.1/4 |
|
| 32-630 |
27x1.1/4 |
|
|
27x1.3/8 |
|
| 28" |
18-622 |
|
|
700x18C |
700x19C |
|
| 19-622 |
|
|
700x19C |
|
|
| 20-622 |
28x1.5/8x.3/4 |
|
700x20C |
|
28x3/4 |
| 22-622 |
28x.7/8 |
|
700x22C |
700x25C |
|
| 23-622 |
28x7/8 |
|
700x23C |
|
28x1 |
| 25-622 |
28x1
28x1.1/16 |
|
700x25C |
700x28C |
|
| 28-622 |
28x1.5/8x1.1/8 28x1.5/8x1.1/4x1.1/8 |
|
700x28C 700C Carrera |
|
28x1.1/8x1.3/4 |
| 30-622 |
|
28x1.20 |
700x28C
|
|
|
| 32-622 |
28x1.5/8x1.1/4 |
|
700C Course 700x32C |
700x35C |
28x1.1/4x1.3/4 |
| 37-622 |
28x1.5/8x1.3/8 |
|
700x35C |
|
28x1.3/8x1.5/8 |
| 40-622 |
28x1.5/8x1.1/2 |
28x1.50 |
700C
700x38C 700x40C |
|
28x1.1/2x1.75 |
| 42-622 |
|
28x1.60 |
700x40C
|
|
28x1.1/2x1.75 |
| 44-622 |
28x1.5/8 |
28x1.625 |
700x42C |
|
|
47-622 47-622T |
28x1.5/8x1.3/4 |
28x1.75 |
700x45C |
|
28x1.75 28x1.3/4 |
|
50-622
|
|
28x1.90
28x2.00
|
|
|
|
|
60-622
|
|
28x2.35 |
|
|
|
| 28-635 |
28x1.1/2x1.1/8 |
|
700x28B |
|
|
| 32-635 |
28x1.1/2x1.1/4 |
|
700x32B 700B Course
|
|
|
| 37-635 |
28x1.1/2x1.3/8 |
|
700x35B |
28x1.3/8x1.1/2 |
|
| 40-635 |
28x1.1/2
28x1.3/8 |
|
700B Standard 700x38B
|
28x1.1/2 |
|
| 44-635 |
28x1.5/8x1.1/2 |
|
700x40B 700x42B
|
|
28x1.75x1.1/2 28x1-5/8x1.1/2
|
| 28-642 |
28x1.3/8x1.1/8 |
|
700x28A |
|
|
| 37-642 |
28x1.3/8 |
|
700x35A |
|
|