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
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