The bicycle tyre conversion chart below is especially useful when looking for replacement tyre, as it gives you different markings for the same tyre size. For example, when you are looking for replacement tyre that has only 28 x 1 5/8 x 1 3/4 on the sidewall, you can find that it is the same tyre if marked also as 47-622, 700 x 45C, 700 x 47C or 28 x 1 3/4.
WARNING: In almost 100% cases, the tyre size fraction part and its decimal equivalent are NOT INTERCHANGEABLE!
E.g. 26 x 1 1/2 and 26 x 1.5 is NOT the same. We welcome any tyre sizing questions at
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Tyre Bead Dia | ETRTO | Imperial | British | French |
---|---|---|---|---|
93 | 47-93 | 7×1 3/4 | 200×47 | |
94 | 47-94 | 8×2 | 200×47 | |
50-94 | 200×50 | |||
110 | 54-110 | 8 1/2 × 2 8 1/2 × 2 1/8 |
||
137 | 32-137 | 8×1 1/4 | ||
152 | 54-152 | 10×2 | ||
194 | 44-194 | 10×1 5/8 | ||
203 | 44-203 | 12 1/2×1.75 | ||
47-203 | 12 1/2×1.75×2 1/4 12 1/2×1.90 |
320×47 | ||
50-203 | 12×2 | 12×2.00 | 320×50 | |
54-203 | 12×1.95 | 320×50 | ||
57-203 | 12 1/2×2 1/4 R | 320×57 | ||
62-203 | 12 1/2×2 1/4 | 320×57 | ||
222 | 44-222 | 11×1 3/4×1 5/8 | ||
47-222 | 11×1 3/4 | |||
239 | 32-239 | 12×1 3/8×1 3/4 | 300×32A | |
57-239 | 12 1/2×2 1/4 | 300×55A | ||
248 | 32-248 | 12×1 1/4 | 300×32 | |
251 | 57-251 | 14 1/2×2 1/4 | 350×55A | |
254 | 47-254 | 14×1.75 14×1.90 |
||
50-254 | 14×2.00 | |||
279 | 40-279 | 14×1 1/2 | 350×38B | |
288 | 32-288 | 14×1 3/8×1 1/4 | 350×32A | |
37-288 | 14×1 3/8 14×1 5/8×1 3/8 |
350×37A 350A Confort 350A Ballon 350A 1/2 Ballon |
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40-288 | 14×1 1/2 NL 14×1 5/8 |
14×1.75 | 350×38A | |
44-288 | 14×1 3/8×1 5/8 | 14×1.75 | 350A 350×42A |
|
298 | 32-298 | 14×1 1/4 | 350A 350×32A |
|
37-298 | 14×1 3/8 | |||
305 | 40-305 | 16×1.50 | ||
44-305 | 16×1.75 16×1.90 |
|||
47-305 | 16×1.75×2 | |||
50-305 | 16×2.00 | |||
54-305 | 16×2 | 16×1.95 16×2.00 |
400×50 | |
57-305 | 16×2.125 | |||
62-305 | 16×2.125 | |||
317 | 47-317 | 16×1 3/4 | ||
330 | 40-330 | 16×1 1/2 | 400×38B | |
337 | 37-337 | 16×1 3/8 NL | ||
340 | 28-340 | 400×30 | ||
32-340 | 16×1 3/8×1 1/4 | 400A 400×32A |
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37-340 | 16×1 3/8 | 400×35A 400A Confort 400A Ballon 400A 1/2 Ballon |
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44-340 | 16×1 5/8 16×1 3/8×1 5/8 |
400×42A | ||
349 | 25-349 | 16×1 Primo | ||
28-349 | 16×1 1/8 | 400×32 | ||
32-349 | 16×1 1/2 NL | 400×32A | ||
35-349 | 16×1.35 | |||
37-349 | 16×1 3/8 | |||
355 | 28-355 | 18×11/8 | ||
35-355 | 18×1.35 | |||
40-355 | 18×1.50 | |||
47-355 | 18×1.75×2 | |||
50-355 | 18×2.00 | |||
357 | 32-357 | 17×1 1/4 | ||
369 | 32-369 | 17×1 1/4 (Moulton) | ||
387 | 37-387 | 18×1 3/8 NL | ||
40-387 | 18×1 1/2 | |||
390 | 28-390 | 18×1 1/8 | 450A 450×28A |
|
32-390 | 18×1 3/8×1 1/4 | 450A 450×32A |
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37-390 | 18×1 3/8 | 450×35A 450A Confort 450A Ballon 450A 1/2 Ballon |
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57-390 | 450×55A | |||
400 | 32-400 | 18×1 1/4 | 450×32 | |
37-400 | 18×1 3/8 | |||
44-400 | 20×1 3/4 | |||
54-400 | 20×2×1 3/4 | |||
406 | 28-406 | 20×1 1/8 | ||
32-406 | 20×1.25 | |||
35-406 | 20×1.35 | |||
37-406 | 20×1 3/8 | |||
40-406 | 20×1.50 | |||
42-406 | 20×1.60 | |||
44-406 | 20×1.75 | |||
47-406 | 20×1.75 20×1.75×2 20×1.90 |
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54-406 | 20×2 | 20×2.125 | 500×50 | |
57-406 | 20×2.125 | |||
60-406 | 20×2.35 | |||
419 | 47-419 | 20×1 3/4 | ||
428 | 44-428 | 20×1 5/8 | ||
54-428 | 20×2.00 | |||
432 | 40-432 | 20×1 1/2 | ||
438 | 32-438 | 20×1 3/8 NL | 500×32A NL | |
37-438 | 20×1 3/8 NL | 500A | ||
40-438 | 20×1 3/8×1 1/2 | 500×38A | ||
440 | 28-440 | 500×28A | ||
32-440 | 20×1 3/8×1 1/4 | 500A 500×32A |
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37-440 | 20×1 3/8 | 500×37A 500A Confort 500A Ballon |
||
40-440 | 20×1 1/2 NL | 500×38A | ||
451 | 25-451 | 20×1 Primo | ||
28-451 | 20×1 1/8 | |||
32-451 | 20×1 1/4 | 500×32 | ||
37-451 | 20×1 3/8 | |||
456 | 50-456 | 22×2.00 | ||
484 | 44-484 | 22×1 1/2 22×1 5/8×1 1/2 |
||
47-484 | 23×2 | 550×50B | ||
54-483 (484) | 23×2.25 | |||
489 | 25-489 | 22×1.00 | ||
32-489 | 22×1 1/4 NL | 550×32A NL | ||
37-489 | 22×1 3/8 22×1 3/8×1 1/4 NL |
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40-489 | 22×1 3/8×1 1/2 | |||
50-489 | 22×2.00 | |||
490 | 28-490 | 550×28A | ||
32-490 | 22×1 3/8×1 1/4 | 550×32A | ||
37-490 | 22×1 3/8 | 550A 550A Confort 550A Ballon |
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498 | 37-498 | 22×1 3/8×1 1/4 | ||
501 | 32-501 | 22×1 1/4 | 550×32 | |
37-501 | 22×1 3/8 | |||
47-501 | 24×1 3/4 R | |||
507 | 37-507 | 24×1.5 | ||
40-507 | 24×1.5 | |||
44-507 | 24×1.625 24×1.75 |
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47-507 | 24×2×1 3/4 | 24×1.75 24×1.85/1.90 24×1.75×2 |
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(49)50-507 | 24×1.85/1.90 24×2.00 24×2.125 |
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54-507 | 24×2.10 | |||
57-507 | 24×2.00 24×2.125 |
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60-507 | 24×2.35 | |||
62-507 | 24×2.40 | |||
508 | 32-508 | 22×1 1/4×1 | 24×1.50 | |
520 | 25-520 | 24×1 | 600×25C | |
28-520 | 24×1 1/8 | 600×28C | ||
47-520 | 24×1 3/4 | |||
57-520 | 25×2.25 | |||
531 | 44-531 | 24×1 5/8×1 1/2 | ||
534 | 35-534 | 24×1 1/2 | 600×32B | |
37-534 | 24×1 1/2×1 3/4 | 600×35B | ||
40-534 | 24×1 1/2 | 600×38B | ||
54-534 | 24×1 1/2×2 | 600×50B 600×50 |
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540 | 25-540 | 24×1.00 | ||
32-540 | 24×1 3/8 24×1 3/8×1 1/4 |
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37-540 | 24×1 3/8 | |||
40-540 | 24×1 3/8×1 1/2 | |||
541 | 22-541 | |||
28-541 | 600×28A | |||
32-541 | 24×1 3/8×1 1/4 NL 24×1 1/4×1 3/8 |
600×32A 600×32A NL |
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37-541 | 24×1 3/8 | 600×35A 600A Confort 600A Ballon 600A 1/2 Ballon |
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37-541 | 24×1 1/2×1 3/8 | 600×38A | ||
547 | 32-547 | 24×1 1/4 | 600A | |
37-547 | 24×13/8 (Schwinn S-5) |
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559 | 25-559 | 26×1.00 | ||
28-559 | 26×1.10 | |||
32-559 | 26×1.25 | |||
35-559 | 26×1.35 | |||
37-559 | 26×1 5/8×1 3/8 | 26×1.40 | ||
40-559 | 26×1.50 | |||
42-559 | 26×1.60 | |||
44-559 | 26×1.625 26×1.50/1.75 |
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47-559 | 26×1.75 26×1.75×2 26×1.80 26×1.85/1.90 |
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50-559 | 26×2 | 26×1.90 26×1.95 26×1.90/2.00 26×2.00/2.10 |
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54-559 | 26×2 | 26×1.95 26×2.10 26×2.125 26×2.20 |
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57-559 | 26×2.125 26×2.20/2.25 26×2.30 |
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60-559 | 26×2.35 26×2.40 |
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62-559 | 26×2.40 26×2.50 |
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565 | 37-565 | 25×1 3/8 | ||
571 | (22)23-571 | 26× 7/8 | 650×(22)23C | |
25-571 | 26×1 5/8×1 | 26×1.75×1 | 650×25C | |
32-571 | 26×1 5/8×1 1/4 | 26×1.75×1 1/4 | 650×32C | |
40-571 | 26×1 3/8×1 1/2 NL 26×1 5/8×1 1/2 26×1 1/2 CS |
650×35C 650×38C |
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47-571 | 26×1 3/4 (Schwinn S-7) |
650×45C 650 CS Confort |
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54-571 | 26×2×1 3/4 | 650×50C | ||
584 | 28-584 | 26×1 1/8×1 1/2 | 650×28B | |
32-584 | 650×32B | |||
35-584 | 26×1 3/8×1 1/2 | 650×35B | ||
37-584 | 26×1 1/2×1 3/8 26×1 3/8×1 1/2 |
650×35B | ||
40-584 | 26×1 5/8×1 1/2 26×1 1/2 |
650B Standard 650×38B |
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44-584 | 26×1 5/8×1 1/2 26×1 1/2×1 5/8 26×1 1/4 – 1 1/2 |
650×42B 650B Confort 650B 1/2 Ballon |
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47-584 | 26×1 1/2×1 3/4 26×1 1/2×2 |
650×45B | ||
57-584 | 27.5×2.25 | 650B | ||
60-584 | 27.5×2.35 | 650B | ||
590 | 20-590 | 650×20A | ||
25-590 | 26×1 1/8×1 1/4 | 650×25A | ||
28-590 | 26×1 1/8 26×1 3/8×1 1/8 |
650×28A | ||
32-590 | 26×1 1/4 26×1 3/8×1 1/4 26×1 1/4×1 3/8 |
650×32A | ||
35-590 | 26×1 3/8 | 650×35A | ||
37-590 | 26×1 3/8 | 26×1.375 | 650A 650×35A |
|
40-590 | 26×1 3/8×1 1/2 26×1 1/2×1 3/8 |
26×1.50 | 650×38A | |
42-590 | 26×1 3/8×1 5/8 26×1 5/8×1 3/8 |
650×40A | ||
44-590 | ||||
597 | 32-597 | 26×1 1/4 | ||
37-597 | 26×1 3/8 (Schwinn S-6) |
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609 | 37-609 | 27×1 3/8×1 1/2 27×1 1/2×1 3/8 |
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40-609 | 27×1 1/2 | |||
622 | 18-622 | 28× 3/4 | 700×18C | |
19-622 | 700×19C | |||
20-622 | 28×1 5/8×1 3/4 28×3/4 |
700×20C | ||
22-622 | 28×7/8 | 700×22C | ||
23-622 | 28×1 28×7/8 28×1 5/8×1 |
700×23C | ||
25-622 | 28×11/16 | 28×1.00 | 700×25C | |
28-622 | 28×1 5/8×1 1/8 28×1 5/8×1 1/4×1 1/8 |
28×1.10 | 700×28C 700C Carrera |
|
30-622 | 28×1.20 | 700×30C | ||
32-622 | 28×1 5/8×1 1/4 27×1 1/4 (pre-1930s) |
28×1.25 | 700C Course 700×32C |
|
35-622 | 28×1 5/8×1 3/8 | 28×1.35 | 700×35C | |
37-622 | 28×1 5/8×1 3/8 | 28×1.40 | 700×35C | |
40-622 | 28×1 5/8×1 1/2 | 28×1.50 | 700C 700×38C |
|
42-622 | 28×1.60 | 700×40C | ||
44-622 | 28×1 5/8 | 28×1.625 | 700×42C | |
47-622 | 28×1 3/4×1 1/4 28×1 5/8×1 3/4 |
28×1.75 | 700×45C 700×47C |
|
50-622 | 28×1 5/8×2 | 28×1.90 | 700×50C | |
54-622 | 29×2.10 | |||
57-622 | 29×2.25 | |||
60-622 | 29×2.35 | |||
62-622 | 29×2.40 | |||
630 | 20-630 | 27×3/4 | ||
22-630 | 27×7/8 | 27×1 | ||
25-630 | 27×1 1/8 27×1 1/16 |
27×1 | ||
28-630 | 27×1 1/4 fifty 27×1 1/4 W/O 27×11/8 27×1 1/4 |
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32-630 | 27×1 1/4 | |||
35-630 | 27×1 3/8 | |||
635 | 28-635 | 28×1 1/2×1 1/8 | 700×28B | |
32-635 | 28×1 1/2×1 1/4 | 700×32B 700B Course |
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37-635 | 28×1 1/2×1 3/8 | 700×35B | ||
40-635 | 28×1 1/2 | 700B 700×38B |
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44-635 | 28×1 1/2×1 5/8 | 700×40B 700×42B |
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642 | 28-642 | 28×1 3/8×1 1/8 | 700×28A | |
37-642 | 28×1 3/8 | 700×35A |
In France the metric system was adopted so metric tyre sizes were introduced. The tyres were really the same size of course, so a nominal conversion factor of 25mm = 1inch was used. The following conversion table can be useful to translate between the two systems.
Diameter | Actual Section | Nominal Section | |||
---|---|---|---|---|---|
(mm) | (in) | (mm) | (in) | (mm) | (in) |
300 | 12 | 25 | 1 | [none] | 1 1/4 |
350 | 14 | 28 (Carrera) | 1 1/8 | A | 1 3/8 |
400 | 16 | 32 (Course) | 1 1/4 | B | 1 1/2 |
450 | 18 | 35 (Confort) 37 (Demi-Ballon) |
1 3/8 | C | 1 5/8 |
500 | 20 | 38 | 1 1/2 | D | 1 3/4 |
550 | 22 | 42 | 1 5/8 | ||
575 | 23 | 45 | 1 3/4 | ||
600 | 24 | 50 | 2 | ||
650 | 26 | ||||
700 | 28 |