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Cycle Components from dotbike Cycle Components from dotbike

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

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.


NominalETRTOBritish ImperialBritish ModernFrenchUSAGerman
7"47-937x1.3/4
8"47-948x220x47-50
50-94200x50
54-110 8.1/2x2.1/8
8.1/2x2
32-137 8x1.1/4
10"54-15210x2
44-19410x1.5/8
11"44-22211x1.3/4 - 1.5/8
47-22211x1.3/4
12"44-20312.1/2x1.7512.1/2x1.75
47-20312.1/2x1.75x2.1/4
12.1/2x1.90
320x5712.1/2x1.75x2.1/4
50-203 12x2.00
54-203 12x1.95
57-20312.1/2x2.1/4 R320x57
62-20312.1/2x2.1/4320x57
32-23912.1/2x1.3/8x1.1/4300x32A
57-23912.1/2x2.1/4300x55A
32-24812x1.1/4300x32
14"57-251T14.1/2x2.1/4315x55
47-25414x1.75
14x1.90
350x32A
40-27914x1.1/2350x38B
32-28814x1.3/8x1.1/4350x32A
37-28814x1.3/8
14x1.5/8x1.38
350A
350x37A
350A Confort
350A Demi-Ballon
40-28814x1.1/2NL
14x1.5/8
14x1.75350x38A
44-28814x1.5/8x1.3/814x1.75 350A
350x42A
32-29814x1.1/4350x32A
37-29814x1.3/8 Universal
16"40-30516x1.50
44-30516x1.75
47-30516x1.75x2
16x1.90
16x1.75x216x1.75x2
54-30516x2400x50
47-31716x1.3/4
40-33016x1.1/2400x38B
37-33716x1.3/8ANL
28-340 400x30A
32-34016x1.3/8x1.1/4 400A
400x32A
37-34016x1.3/8
16x1.3/8x1.1/4
400x35A
400A Confort
400A Demi-Ballon
44-34016x1.3/8x1.5/8400x42A
25-34916x1 Primo
16x1.1/8
28-34916x1.1/4NL400X32
32-34916x1.3/8 Universal
37-34916x1.3/8 Universal
17"32-35717x1.1/4
32-36917x1.1/4 (Moulton)
18"28-35518x1.1/8
40-355 18x1.50
47-355 18x1.75x2
18x1.90
37-38718x1.3/8NL
40-38718x1.1/2
28-39018x1.1/8 450B
450x28A
32-39018x1.3/8x1.1/4 450A
450x32A
37-39018x1.3/8 450A Confort
450A Demi-Ballon
55-390450x55A
57-390T450x55A
450A
32-40018x1.1/4450x32
37-40018x1.3/8 Universal
47-44018x1.75x2
20"44-400T20x1.3/4
36-40620x1.5020x1.50
37-40620x1.3/820x1.5020x1.50
44-40620x1.62520x1.625
47-406 20x1.75
20x1.75x2
20x1.75
54-40620x220x2.125500x5020x2.125
57-40620x2.125
47-41920x1.3/4
44-42820x1.5/8
40-43220x1.1/2
32-43820x1.3/8NL500x32ANL
37-43820x1.3/8NL500A
28-440500x28A
32-44020x1.3/8x1.1/4 500A
500x32A
37-440 500A Confort
500A Demi-Ballon
500x37A
40-44020x1.1/2NL500x38A
25-45120x1 Primo
28-45120x1.1/8
32-45120x1.1/4500x32
37-45120x1.3/8 Universal
22"44-48422x1.1/222x1.5/8-1.1/2
32-489550x32ANL22x1.1/4NL
37-48922x1.3/8x1.1/4NL
28-490550x28A
32-49022x1.3/8x1.1/4550A
550x32A
37-49022x1.3/8 550A
550A Confort
550A Demi-Ballon
32-50122x1.1/4550x32
37-50122x1.3/8 Universal
23"47-48423x2550x50B23x2
54-48323x2.25
24"47-501T24x1.3/4R
37-50724x1.5
47-50724x2x1.3/4 24x1.75
24x1.75x2
24x1.85
24x1.90
24x1.7524x1.75/2
32-50824x1.522x1.1/4x1
25-52024x1600x25C
28-52024x1.1/8600x28C
47-52024x1.3/4
44-53124x1.5/8x1.1/2
35-53424x1.1/2600x32B
37-53424x1.1/2x1.3/4600x35B
40-53424x1.1/2600x38B24x1.1/2
54-534 24x1.1/2x2
25x2
600x50B
625x50
28-541600x28A
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
40-54024x1.3/8x1.1/2
24x1.3/8
600x38A24x1.1/2x1.3/8
32-54724x1.1/4600A
25"37-56525x1.3/8
26"32-55926x1.25
37-55926x1.5/8x1.3/826x1.4
26x1.5
26x1.5
40-559 26x1.50
44-55926x1.625
26x1.75
47-55926x1.85
26x1.95
26x1.7526x1.75x2
50-55926x226x226x2
54-559
54-559T
26x226x2.125
26x2.10
26x2.125
25-57126x1.5/8x1650x25C26x1.75x1
32-57126x1.5/8x1.1/4650x32C26x1.75x1.1/4
40-571 26x1.3/8x1.1/2NL
26x1.1/2CS
650x35C
650x38C
47-571
47-571T
26x1.3/4 650x45C
650CSC
54-57126x2x1.3/4650x50C26x2x1.3/4
37-58426x1.1/2
26x1.1/2x1.3/8
650x35B26x1.3/8x1.1/2
40-58426x1.5/8x1.1/2
26x1.1/2
650B Semi-Confort
650x38B
26x1.5
44-58426x1.1/2x1.5/8650B Demi Confort 26x1.5/8x1.1/2
26x1.3/4x1.1/2
47-58426x1.1/2x1.3/4650x45B
28-59026x1.1/8
26x1.3/8x1.1/8
650x28A
32-59026x1.1/4
26x1.3/8x1.1/4
650x32A26x1.1/4x1.3/8
35-59026x1.3/8650x35A
37-59026x1.3/826x1.375 (Green) 650A
650x35A
26x1.3/8
40-59026x1.3/8x1.1/226x1.50650x38A26x1.1/2x1.3/8
32-59726x1.1/426x1.1/4
27"40-60927x1.1/2
20-63027x.3/4
22-630 27x7/8
23-630 27x7/8
27x1
25-63027x1
27x1/16
2x71.1/8
28-63027x1.1/8
27x1.1/4fifty
27x1.1/4
32-63027x1.1/427x1.3/8
28"18-622700x18C700x19C
19-622700x19C
20-62228x1.5/8x.3/4700x20C28x3/4
22-62228x.7/8700x22C700x25C
23-62228x7/8700x23C28x1
25-62228x1
28x1.1/16
700x25C700x28C
28-622 28x1.5/8x1.1/8
28x1.5/8x1.1/4x1.1/8
700x28C
700C Carrera
28x1.1/8x1.3/4
30-62228x1.20 700x28C
32-62228x1.5/8x1.1/4 700C Course
700x32C
700x35C28x1.1/4x1.3/4
37-62228x1.5/8x1.3/8700x35C28x1.3/8x1.5/8
40-62228x1.5/8x1.1/228x1.50 700C
700x38C
700x40C
28x1.1/2x1.75
42-62228x1.60700x40C 28x1.1/2x1.75
44-62228x1.5/828x1.625700x42C
47-622
47-622T
28x1.5/8x1.3/428x1.75700x45C 28x1.75
28x1.3/4
50-622 28x1.90
28x2.00
60-622 28x2.35
28-63528x1.1/2x1.1/8700x28B
32-63528x1.1/2x1.1/4 700x32B
700B Course
37-63528x1.1/2x1.3/8700x35B28x1.3/8x1.1/2
40-63528x1.1/2
28x1.3/8
700B Standard
700x38B
28x1.1/2
44-63528x1.5/8x1.1/2 700x40B
700x42B
28x1.75x1.1/2
28x1-5/8x1.1/2
28-64228x1.3/8x1.1/8700x28A
37-64228x1.3/8700x35A