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Size Markings
What do the various size markings on bicycle tires mean?
Nowadays, bicycle tires sizes should all fall in line with ETRTO’s (European Tire and Rim Technical Organization) tire and rim standards. Yet the older English and French tire size markings are still used.
An ETRTO size marked 37-622 indicates the width of 37 mm and the tire inner diameter of 622 mm. This designation is clear and allows an unequivocal match with the corresponding rim size.
Inch size designations are less accurate. A tire marked 28 x 1 5/8 x 1 3/8 indicates an approximate outer diameter of 28 inch, the tire section height of 1 5/8-inch, and the tire section width of 1 3/8-inch. Inch sizes can also follow the pattern 26 x 2.10, which, in this case indicates only tire’s outer diameter and the tire’s section width.
Inch sizes are ambiguous and lack accuracy. For example, the diameters 559 mm (MTB), 571 mm (Triathlon) and 590 mm (Touring) are all designated 26 inch. Tires with diameters 622 mm and 635 mm are both designated 28-inch, yet, surprisingly, tires with a diameter of 630 mm are designated 27-inch.
A French size marked 700 x 35C, indicates the approximate tire outer diameter of 700 mm and the tire section width of 35 mm. Not all tire sizes exist as French size designations, for instance MTB sizes.
Size designations on the tire
Size Designations Overview
| ETRTO | Inch | French | |
| Size designation | 37-622 | 28x1 5/8 x 1 3/8 | 700x35c |
| Outer diameter | - | Approx. 28" | Approx. 700mm |
| Inner diameter | 622 mm | - | - |
| Tire section width | Approx. 37 mm | Approx. 1 3/8" | Approx. 35 mm |
| Tire section height | - | Approx. 1 5/8" | - |
How many tire sizes are there?
The following table shows all common tire sizes This table lists, where applicable, a corresponding ETRTO-size for virtually every tire size.
| ETRTO | Inch | French | |
| 7" | 47-93 | 7 x 1 3/4 | |
| 8" | 47-94 |
20 x 47-50 |
|
| 50-94 | 200 x 50 | ||
| 54-110 | 8 x 2 1/8 8 1/2 x 2 |
||
| 32-137 | 8 x 1 1/4 | ||
| 10" | 54-152 44-194 |
10 x 2 10 x 1 5/8 |
|
| 11" | 47-222 | 11 x 13/4 | |
| 12" | 47-203 | 12 1/2 x 1.75 12 1/2 x 1.90 |
|
| 54-203 | 12 x 1.95 | ||
| 57-203 | 12 1/2 x 2 1/4 R | ||
| 62-203 | 12 1/2 x 2 1/4 | ||
| 32-239 | 12 1/2 x 1 3/8 x 1 1/4 | 300 x 32A | |
| 57-239 | 12 1/2 x 2 1/4 | 300 x 55A | |
| 14" | 57-251 | 14 1/2 x 2 1/4 | 300 x 55A |
| 47-254 | 14 x 1.75
14 x 1.90 |
||
| 40-279 | 14 x 11/2 | 350 x 38B | |
| 37-288 | 14 x 1 5/8 x 1 3/8 | 350A 350A 350A Confort 350A Ballon 350A 1/2Ballon 350 x 32A |
|
| 40-288 | 14 x 1 5/8 | 350 x 38A | |
| 44-288 | 14 x 1 5/8 x 1 3/8 | 350A 350 x 42A |
|
| 32-298 | 14 x 1 1/4 | 350A 350 x 32A |
|
| 16" | 40-305 | 16 x 1.50 | |
| 47-305 | 16 x 1.75 16 x 1.90 |
||
| 54-305 | 16 x 1.95
16 x 2.00 |
||
| 57-305 | 16 x 2.125 | ||
| 40-330 | 16 x 1 1/2 | 400 x 38B | |
| 28-340 | 400 x 30A | ||
| 32-340 | 16 x 1 3/8 x 1 1/4 | 400A 400 x 32A |
|
| 37-340 | 16 x 1 3/8 x 1 1/4 | 400 x 35A 400A Confort 400A Ballon 400A 1/2 Ballon |
|
| 44-340 | 16 x 1 5/8 | ||
| 28-349 | 16 x 11/8 | ||
| 32-349 | 16 x 11/4 NL | ||
| 37-349 | 16 x 1 3/8 | ||
| 17" | 32-357 | 17 x 1 1/4 | |
| 37-369 | 17 x 1 1/4 | ||
| 18" | 28-355 | 18 x 1 1/8 | |
| 40-355 | 18 x 1.50 | ||
| 47-355 | 18 x 1.75 18 x 1.90 |
||
| 37-387 | 18 x 1 3/8 | ||
| 40-387 | 18 x 1 1/2 | ||
| 28-390 | 18 x 1 1/8 | 450 x 28A
450A |
|
| 37-390 | 18 x 1 3/8 | 450 x 35A 450A 450A Confort |
|
| 55-390 | 450 x 55A | ||
| 57-390 | 450 x 55A 450A |
||
| 37-400 | 18 x 1 3/8 | ||
| 20" | 54-400 | 20 x 2 x 1 3/4 20 x 2F4J |
|
| 28-406 | 20 x 1 1/8 | ||
| 32-406 | 20 x 1.25 | ||
| 35-406 | 20 x 1.35 | ||
| 37-406 | 20 x 1 3/8 | ||
| 40-406 | 20 x 1.50 | ||
| 44-406 | 20 x 1.625 | ||
| 47-406 | 20 x 1.75 20 x 1.90 |
||
| 50-406 | 20 x 2.00 | ||
| 54-406 | 20 x 2.00 | ||
| 57-406 | 20 x 2.125 | ||
| 54-428 | 20 x 2.00 | ||
| 40-432 | 20 x 1 1/2 | ||
| 37-438 | 20 x 1 3/8 | 500A | |
| 40-438 | 20 x 1 3/8 | 500 x 38A | |
| 28-440 | 500 x 28A
500A |
||
| 40-440 | 20 x 1 1/2NL | 500 x 38A | |
| 28-451 | 20 x 1 1/8 | ||
| 37-451 | 20 x 1 3/8 B.S. | ||
| 22" | 44-484 | 22 x 15/8 x 11/2 | |
| 25-489 | 22 x 1.00 | ||
| 37-489 | 22 x 1 3/8 NL | ||
| 40-489 | 22 x 1 3/8 x 1 1/2 | ||
| 50-489 | 22 x 2.00 | ||
| 28-490 | 550 x 28A 550A 550A Standard |
||
| 32-490 | 22 x 1 3/8 x 1 1/4 | 550 x 32A 550A |
|
| 37-490 | 22 x 13/8 | 550 x 35A
550A Confort |
|
| 37-498 | 22 x 1 3/8 x 1 1/4 | ||
| 32-501 | 22 x 1 1/4 | ||
| 37-501 | 22 x 1 3/8 | ||
| 24" | 40-507 | 24 x 1.50 | |
| 44-507 | 24 x 1.625 24 x 1.75 |
||
| 47-507 | 24 x 1.75 24 x 1.85/1.90 |
||
| 49-507 | 24 x 1.85 | ||
| 50-507 | 24 x 1.90/2.00 24 x 2.00 24 x 2.125 |
||
| 54-507 | 24 x 2.10 | ||
| 57-507 | 24 x 2.125 24 x 2.00 |
||
| 60-507 | 24 x 2.35 | ||
| 44-531 | 24 x 1 5/8 x 1 1/2 | ||
| 40-534 | 24 x 1 1/2 | ||
| 25-540 | 24 x 1.00 | ||
| 32-540 | 24 x 1 3/8 x 1 1/4 24 x 1 3/8 |
||
| 37-540 | 24 x 1 3/8 | ||
| 40-540 | 24 x 1 3/8 x 1 1/2 | ||
| 22-541 | |||
| 25-541 | 600 x 25A | ||
| 28-541 | 600 x 28A 600A 600A Standard |
||
| 32-541 | 24 x 1 3/8 x 1 1/4 N4 | 600 x 32A | |
| 37-541 | 600 x 35A 600A Confort 600A Ballon 600A 1/2 Ballon |
||
| 26" | 25-559 | 26 x 1.00 | |
| 35-559 | 26 x 1.35 | ||
| 37-559 | 26 x 1 5/8 x 1 3/8 26 x 1.40 |
||
| 40-559 | 26 x 1.50 | ||
| 44-559 | 26 x 1.625 26 x 1.50/1.75 |
||
| 47-559 | 26 x 1.75
26 x 1.85/1.90 |
||
| 50-559 | 26 x 1.90 26 x 1.95 26 x 1.90/2.00 |
||
| 54-559 | 26 x 1.95
26 x 2.10 |
||
| 57-559 | 26 x 2.125
26 x 2.20/2.25 |
||
| 60-559 | 26 x 2.35 | ||
| 62-559 | 26 x 2.50 | ||
| 20-571 | 26 x 3/4 | 650 x 20C | |
| 23-571 | 26 x 7/8 | 650 x 22C | |
| 40-571 | 26 x 1 1/2 CS 26 x 1 3/8 x 1 1/2 NL 26 x 1 5/8 x 1 1/2 |
650 x 35C 650 x 38C |
|
| 47-571 | 26 x 1 3/4 650 CS confort |
650 x 45C | |
| 54-571 | 26 x 2 x 1 3/4 | 650 x 50C | |
| 28-584 | 26 x 1 1/8 x 1 1/2 | 650 x 28B | |
| 32-584 | 650 x 32B | ||
| 35-584 | 26 x 1 3/8 x 1 1/2 | 650 x 35B 650B Standard |
|
| 37-584 | 26 x 1 1/2 x 1 3/8
26 x 1 1/2 |
650 x 35B | |
| 40-584 | 26 x 1 5/8 x 1 1/2 | 650 x 42B
650B Semi-Confort |
|
| 20-590 | 650 x 20A | ||
| 25-590 | 26 x 1 1/8, 1 1/4 26 x 1 3/8 - 1 1/4 |
650 x 32A | |
| 28-590 | 26 x 1 1/8 | 650 x 28A | |
| 32-590 | 26 x 1 1/4
26 x 1 3/8 x1 1/4 |
650 x 32A | |
| 35-590 | 26 x 1 3/8 | 650 x 35A | |
| 37-590 | 26 x 1 3/8 | 650 x 35A 650A |
|
| 40-590 | 26 x 1.50 28 x 1 3/8 x 1 1/2 |
650 x 38A | |
| 44-590 | |||
| 32-597 | 26 x 1 1/4 | ||
| 27" | 40-609 | 27 x 1 1/2 | |
| 20-630 | 27 x 3/4 | ||
| 22-630 | 27 x 7/8 | ||
| 25-630 | 27 x 1.00 27 x 1 1/16 |
||
| 28-630 | 27 x 1 1/8 27 x 1 1/4 Fifty 27 x 1 1/4 |
||
| 32-630 | 27 x 1 1/4 | ||
| 28/32-630 | 27 x 1 1/4 | ||
| 35-630 | 27 x 1 3/8 | ||
| 28" | 18-622 | 28 x 3/4 | 700 x 18C |
| 19-622 | 700 x 19C | ||
| 20-622 | 28 x 3/4 | 700 x 20C | |
| 22-622 | 28 x 7/8 | 700 x 22C | |
| 23-622 | 28 x 7/8 | 700 x 23C | |
| 25-622 | 28 x 1.00, 1 1/16 | 700 x 25C | |
| 30-622 | 28 x 1.20 | 700 x 28C | |
| 28-622 | 28 x 1 5/8 x 1 1/8 | 700 x 30C | |
| 32-622 | 28 x 15/8 x 11/4 | 700 x 32C 700C COURSE |
|
| 35-622 | 28 x 15/8 x 13/8 | 700 x 35C | |
| 37-622 | 28 x 1 5/8 x 1 3/8 | 700 x 35C | |
| 40-622 | 28 x 1.50 28 x 1 5/8 x 1 1/2 |
700 x 38C | |
| 42-622 | 28 x 1.60 | 700 x 40C | |
| 44-622 | 28 x 1.625 | 700 x 42C | |
| 47-622 | 28 x 1.75 | 700 x 45C | |
| 50-622 | 28 x 1.90 28 x 2.00 |
||
| 60-622 | 28 x 2.35 | ||
| 32-635 | 28 x 1 1/2 x 1 1/8 | 770 x 28B
700 x 28B |
|
| 40-635 | 28 x 1 1/2 28 x 1 1/2 x 1 3/8 |
700 x 38B 700 x 35B 700 Standard 700B Standard |
|
| 44-635 | 28 x 15/8 x 11/2 | 700 x 40/42B | |
| 28-642 | 28 x 1 3/8 x 1 1/8 | 700 x 28A | |
| 37-642 | 28 x 1 3/8 | 700 x 35A |