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Conversions

Tire sizes differ by standard, make sure your tire matches your rim diameter.

Checkout Dimensional Conversions tables




SIZES ARE EXPRESSED DIFFERENTLY ACCORDING TO THE VARIOUS STANDARDS OR USES.

MTB AND CITY TYRE SIZES ARE GIVEN IN INCHES. In this example: 26 x 1 1/8 x 1 1/2, the first number (26) is the overall tyre diameter. The second number (1 1/8) is the height of the tyre in inches and fractions of an inch. The third number (1 1/2) is the tyre width in inches and fractions of an inch.

FRENCH SIZES are used for Road tyres. In this example: 650 x 32A, the first number (650) is the overall diameter of the tyre in millimeters. The second number (32) is the tyre width in millimeters. The letter A indicates that the rim is 590 mm.

ETRTO (EUROPEAN TYRE AND RIM TECHNICAL ORGANIZATION) SIZES are given for all tyres. In this example: 32 x 590, the first number (32) is the tyre width in millimeters. The second number (590) is the tyre diameter in millimeters. This chart shows the conversions for all the sizes.

Bike Conversion 12"

ETRTOINCHESMM
47-20312 x 1.75-
/12x 1.90-
/12 1/2 x 1.75-
/12 1/2 x 1.90-
50-20312 x 2.00-
54-20312 x 1.95-
57-20312 1/2 x 2 1/4-
62-20312 1/2 x 2 1/4-
47-25414 x 1.75-
/14 x 1.90-
50-25414 x 2.00-
40-27914 x 1 1/2350 x 388
37-28814 x 1 3/8350 x 35A
/14 x 1 5/8 x 1 3/8-
40-28814 x 1 5/8350 x 38A
44-28814 x 1 5/8 x 1 3/8350 x 42A
47-28814 x 1.75-
32-29814 x 1 1/4350 x 32A

Bike Conversion 16"

ETRTOINCHESMM
40-30516 x 1.5-
47-30516 x 1.75-
/16 x 1.90-
50-30516 x 2.00-
54-30516 x 1.95-
/16 x 2.00-
57-30516 x 2.125-
40-33016 x 1 1/2400 x 38B
28-340-400 x 30A
32-34016 x 1 3/8 x 1 1/4400 x 32A
37-34016 x 1 3/8400 x 35A
44-34016 x 1 5/8-
28-34916 x 1 1/8-
30-34916 x 1.20-
32-34916 x 1 1/4-
/16 x 1.25-
35-34916 x 1.35-
37-34916 x 1 3/8-

Bike Conversion 17"

ETRTOINCHESMM
32-35717 x 1 1/4-
32-36917 x 1 1/4-

Bike Conversion 18"

ETRTOINCHESMM
28-35518 x 1 1/8-
32-35518 x 1.25-
35-35518 x 1.35-
40-35518 x 1.50-
42-35518 x 1.60-
47-35518 x 1.75-
/18 x 1.90-
50-35518 x 2.00-
37-38718 x 1 1/2-
28-39018 x 1 1/8450 x 28A
37-39018 x 1 3/8450 x 35A
55-390-450 x 55A
57-390-450 x 55A
37-40018 x 1 3/8-

Bike Conversion 20"

ETRTOINCHESMM
54-40020 x 2 x 1 3/4-
23-40620 x 0.90-
25-40620 x 1.00-
28-40620 x 1.10-
/20 x 1 1/8-
32-40620 x 1.25-
35-40620 x 1.35-
37-40620 x 1.40-
/20 x 1 3/8-
40-40620 x 1.50-
42-40620 x 1.60-
44-40620 x 1.50-
/20 x 1.625-
47-40620 x 1.75-
/20 x 1.90-
50-40620 x 2.00-
54-40620 x 2.10-
/20 x 2.00-
55-40620 x 2.15-
57-40620 x 2.25-
/20 x 2.125-
60-40620 x 2.35-
54-42820 x 2.00-
40-43220 x 1 1/2-
37-43820 x 1 3/8-
40-43820 x 1 3/8 x 1 1/2-
28-440-500 x 28A
37-440-500 x 35A
40-44020 x 1 1/2500 x 38A
23-45120 x 0.90-
/20 x 1 7/8-
25-45120 x 1.00-
28-45120 x 1 1/8-
37-45120 x 1 3/8-

Bike Conversion 22"

ETRTOINCHESMM
44-45722 x 1.75-
44-48422 x 1 5/8 x 1 1/2-
25-48922 x 1.00-
37-48922 x 1 3/8 NL-
40-48922 x 1 3/8 x 1 1/2-
50-48922 x 2.00-
28-490-500 x 28A
32-49022 x 1 3/8 x 1 1/4500 x 32A
37-49022 x 1 3/8500 x 35A
47-49822 x 1 3/8 x 1 1/4-
25-50122 x 1.00 B.S.-
32-50122 x 1 1/4-
37-50122 x 1 1/4-

Bike Conversion 24"

ETRTOINCHESMM
40-50724 x 1.50-
44-50724 x 1.625-
/24 x 1.75-
47-50724 x 1.75-
/24 x 1.85-
/24 x 1.90-
50-50724 x 2.00-
/24 x 1.90-
/24 x 2.125-
54-50724 x 2.10-
55-50724 x 2.15-
57-50724 x 2.25-
/24 x 2.125-
60-50724 x 2.35-
62-50724 x 2.40-
23-52024 x 0.90-
/24 x 7/8-
44-53124 x 1 5/8 x 1 1/2-
40-53424 x 1 1/2-
20-54024 x 3/4-
23-54024 x 0.90-
/24 x 7/8-
25-54024 x 1.00-
30-54024 x 1.20-
32-54024 x 1 3/8 x 1 1/4-
37-54024 x 1 3/8-
40-54024 x 1 3/8 x 1 1/2-
22-541--
25-541-600 x 25A
28-541-600 x 28A
32-54124 x 1 3/8 x 1 1/4 NL600 x 32A
37-541-600 x 35A

Bike Conversion 26"

ETRTOINCHESMM
20-559--
23-55926 x 0.90-
/26 x 7/8-
25-55926 x 1.00-
28-55926 x 1.10-
30-55926 x 1.20-
32-55926 x 1.25-
35-55926 x 1.35-
37-55926 x 1.40-
/26 x 1 5/8 x 1 3/8-
40-55926 x 1.50-
42-55926 x 1.60-
44-55926 x 1.625-
44-55926 x 1.75-
47-55926 x 1.75-
/26 x 1.80-
/26 x 1.85-
/26 x 1.90-
/26 x 2.00-
50-55926 x 2.00-
/26 x 1.90-
/26 x 1.95-
52-55926 x 2.00-
54-55926 x 2.10-
/26 x 1.95-
/26 x 2.125-
57-55926 x 2.25-
/26 x 2.125-
/26 x 2.20-
58-55926 x 2.35-
62-55926 x 2.40-
/26 x 2.50-
64-55926 x 2.50-
65-55926 x 2.60-
70-55926 x 2.75-
75-55926 x 3.00-
95-55926 x 3.70-
/26 x 3.80-
100-55926 x 4.00-
115-55926 x 4.50-
120-55926 x 4.80-
20-57126 x 3/4-
23-57126 x 7/8650 x 23C
40-57126 x 1 1/2 CS650 x 38C
/26 x 1 3/8 x 1 1/2 NL-
40-57126 x 1 3/4650 x 45C
/-650 CS Confort
54-57126 x 2 x 1 3/4650 x 50C
20-59026 x 3/4650 x 20A
25-59026 x 1.00650 x 25A
28-59026 x 1 3/8 x 1 1/8650 x 28A
32-59026 x 1 3/8 x 1 1/4650 x 32A
37-59026 x 1 3/8650 x 35A
40-59026 x 1.50650 x 38A
/26 x 1 3/8 x 1 1/2-
42-59026 x 1 5/8650 x 40A
32-59726 x 1 1/4-

Bike Conversion 27"

ETRTOINCHESMM
40-60927 x 1 1/2-
20-63027 x 3/4-
22-63027 x 7/8-
25-63027 x 1.00-
/27 x 1 1/16-
28-63027 x 1 1/8-
32-63027 x 1 1/4-
35-63027 x 1 3/8-

Bike Conversion 27.5"

ETRTOINCHESMM
28-58426 x 1 1/8 x 1 1/2650 x 28B
32-584-650 x 32B
35-58427.5 x 1.35650B
/26 x 1 3/8 x 1 1/2650 x 35B
37-58427.5 x 1.40650B
/26 x 1 1/2 x 1 3/8650 x 35B
/650 Standard
40-58427.5 x 1.50650B
/26 x 1 5/8 x 1 1/2650 x 38B
44-58427.5 x 1.65650B
/26 x 15/8 x 1 2/2650 x 42B
/-650B Semi-Confort
/-650B 1/2 Ballon
47-58427.5 X 1.75650B
50-58427.5 X 2.00650B
52-58427.5 X 2.00650B
54-58427.5 X 2.10650B
/26 X 1 1/2 x 2-
55-58427.5 X 2.25650B
58-58427.5 X 2.35650B
61-58427.5 X 2.40650B
64-58427.5 X 2.50650B
66-58427.5 X 2.60650B
70-58427.5 X 2.75650B
71-58427.5 X 2.80650B
74-58427.5 X 2.90650B
75-58427.5 X 3.00650B

Bike Conversion 28"

ETRTOINCHESMM
18-62228 x 3/4700 x 18C
19-622-700 x 19C
/-700 x 19
20-62228 x 3/4700 x 20C
22-62228 x 7/8700 x 22C
/-700 x 22
23-62228 x 0.90700 x 23C
/28 x 7/8-
24-622-700 x 24C
25-62228 x 1.00700 x 25C
/28 x 1 1/16-
26-622-700 x 26C
28-62228 x 1.10700 x 28C
/28 x 1 5/8 x 1 1/8-
30-62228 x 1.20700 x 30C
32-62228 x 1.25700 x 32C
/28 x 1 5/8 x 1 1/4-
33-62228 x 1.30700 x 33C
35-62228 x 1.35700 x 35C
37-62228 x 1.40700 x 35C
/28 x 1 5/8 x 1 3/8-
40-62228 x 1.50700 x 38C
/28 x 1 5/8 x 1 1/2-
42-62228 x 1.60700 x 40C
44-62228 x 1.625700 x 42C
47-62228 x 1.75700 x 45C
50-62228 x 2.00-
/29 x 2.00-
/28 x 1.90-
55-62228 x 2.15-
/29 x 2.15-
60-62228 x 2.35-
/29 x 2.35-
32-63528 x 1 1/2 x 1 1/8770 x 28B
/-700 x 28B
/-700B Course
40-63528 x 1 1/2700 x 38B
/28 x 1 1/2 x 1 5/8700B Standard
44-63528 x 1 5/8 x 1 1/2700 x 42B
28-64228 x 1 5/8 x 1 1/2700 x 28A
37-62428 x 1 3/8700 x 35A

Bike Conversion 29"

ETRTOINCHESMM
50-62229 x 2.00-
52-62229 x 2.00-
/28 x 2.00-
54-62229 x 2.10-
/28 x 2.10-
55-62229 x 2.15-
/28 x 2.15-
55-62229 x 2.25-
58-62229 x 2.35-
61-62229 x 2.40-
/28 x 2.35-
75-62229 x 3.00-
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