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How To Pick the Correct Tire and Tube Size?

Bike tires are made in different sizes, depending on the type and purpose of the bike. Tubes also need to be the right size for your bike. We’ve prepared a detailed guide to help you make sense of it.

Tire size is mainly given in inches, with the tires being made in diameters of 12, 14, 16, 18, 20, 22, 24, 26, 27.5, 28 and 29 inches.

You can also find the size given in millimetres – according to ETRTO (European Tire and Rim Technical Organisation) – and it is the most precise measurement. With bikes, you can find tire size 26x2,.1 (54-559), which denotes a tire with tire / rim inner diameter of 26 inches in (559 mm) and the width of 2.1 inch (54 mm). If given, it is advisable to follow this dimension in particular, as there are the same outer dimensions of the casing with a different inner diameter. For example, a 28 "tire may have an inside diameter of 622 mm or 635 mm. The tire may not fit in the rim.

Other accepted measure is the so called French standard that gives an approximate outer diameter and the width of the tire, i.e. 700x35C – approximate outer diameter (700 mm) and tire width (35 mm). The letter C stands for inner diameter, in this case 622 mm. The French standard does not apply to all available tires.

If you are picking out tires for your bike, find at least two dimensions (i.e. on the original tire) and use them to choose a new one. While doing so, keep in mind that the diameter always has to be the same as the current tire while the width can vary. However, you can only buy a tire that will fit within your bike frame and the size of its rims. The basic principle is that the width of the rim should always be smaller than the width of the tire. If the tire is too wide, however, it may not fit into the frame or the fork.

Tube sizes are similar, but there is usually a range of width given. Thanks to the flexibility of the tube, you can use one tube for more rim (tire) diameters.

Conversion table:

  ETRTO inches France
12"
  47-203 12 x 1.75  
    12 x 1.90  
    12 ½ x 1.75  
    12 ½ x 1.90  
  50-203 12 x 2.00  
  54-203 12 x 1.95  
  57-203 12 ½ x 2 ¼  
  62-203 12 ½ x 2 ¼  
14"
  47-254 14 x 1.75  
    14 x 1.90  
  50-254 14 x 2.00  
  40-279 14 x 1 ½ 350 x 38B
  37-288 14 x 1 3⁄8 350 x 35A
    14 x 1 5⁄8 x 1 3⁄8  
  40-288 14 x 1 5⁄8 350 x 38A
  44-288 14 x 1 5⁄8 x 1 3⁄8 350 x 42A
  47-288 14 x 1.75  
  32-298 14 x 1 ¼ 350 x 32A
16"
  40-305 16 x 1.50  
  47-305 16 x 1.75  
    16 x 1.90  
  50-305 16 x 2.00  
  54-305 16 x 1.95  
    16 x 2.00  
  57-305 16 x 2.125  
  40-330 16 x 1 ½ 400 x 38B
  28-340   400 x 30A
  32-340 16 x 1 3⁄8 x 1 1⁄4 400 x 32A
  37-340 16 x 1 3⁄8 400 x 35A
  44-340 16 x 1 5⁄8  
  28-349 16 x 1 1⁄8  
  30-349 16 x 1.20  
  32-349 16 x 1 ¼  
    16 x 1.25  
  35-349 16 x 1.35  
  37-349 16 x 1 3⁄8  
17"
  32-357 17 x 1 ¼  
  32-369 17 x 1 ¼  
18"
  28-355 18 x 1 1⁄8  
  32-355 18 x 1.25  
  35-355 18 x 1.35  
  40-355 18 x 1.50  
  42-355 18 x 1.60  
  47-355 18 x 1.75  
    18 x 1.90  
  50-355 18 x 2.00  
  37-387 18 x 1 ½  
  28-390 18 x 1 1⁄8 450 x 28A
  37-390 18 x 1 3⁄8 450 x 35A
  55-390   450 x 55A
  57-390   450 x 55A
  37-400 18 x 1 3⁄8  
20"
  54-400 20 x 2 x 1 ¾  
  23-406 20 x 0.90  
  25-406 20 x 1.00  
  28-406 20 x 1.10  
    20 x 1 1⁄8  
  32-406 20 x 1.25  
  35-406 20 x 1.35  
  37-406 20 x 1.40  
    20 x 1 3⁄8  
  40-406 20 x 1.50  
  42-406 20 x 1.60  
  44-406 20 x 1.50  
  44-406 20 x 1.625  
  47-406 20 x 1.75  
  47-406 20 x 1.90  
  50-406 20 x 2.00  
  54-406 20 x 2.10  
    20 x 2.00  
  55-406 20 x 2.15  
  57-406 20 x 2.25  
    20 x 2.125  
  60-406 20 x 2.35  
  54-428 20 x 2.00  
  40-432 20 x 1 ½  
  37-438 20 x 1 3⁄8  
  40-438 20 x 1 3⁄8 x 1 ½  
  28-440   500 x 28A
  37-440   500 x 35A
  40-440 20 x 1 ½ NL 500 x 38A
  23-451 20 x 0.90  
    20 x 7⁄8  
  25-451 20 x 1.00  
  28-451 20 x 1 1⁄8  
  37-451 20 x 1 3⁄8 B.S.  
22"
  44-457 22 x 1.75  
  44-484 22 x 1 5⁄8 x 1 ½  
  25-489 22 x 1.00  
  37-489 22 x 1 3⁄8 NL  
  40-489 22 x 1 3⁄8 x 1 ½  
  50-489 22 x 2.00  
  28-490   550 x 28A
  32-490 22 x 1 3⁄8 x 1 1⁄4 550 x 32A
  37-490 22 x 1 3⁄8 550 x 35A
  47-498 22 x 1 3⁄8 x 1 1⁄4  
  25-501 22 x 1.00 B.S.  
  32-501 22 x 1 ¼  
  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  
    24 x 1.90  
  50-507 24 x 2.00  
    24 x 1.90  
    24 x 2.125  
  54-507 24 x 2.10  
  55-507 24 x 2.15  
  57-507 24 x 2.25  
    24 x 2.125  
  60-507 24 x 2.35  
  62-507 24 x 2.40  
  23-520 24 x 0.90  
    24 x 7⁄8  
  44-531 24 x 1 5⁄8 x 1 1⁄2  
  40-534 24 x 1 ½  
  20-540 24 x ¾  
  23-540 24 x 0.90  
    24 x 7⁄8  
  25-540 24 x 1.00  
  30-540 24 x 1.20  
  32-540 24 x 1 3⁄8 x 1 1⁄4  
  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
  32-541 24 x 1 3⁄8 x 1 1⁄4 NL 600 x 32A
  37-541   600 x 35A
25"
  57-520 25 x 2.25  
  ETRTO palce Francie
26"
  20-559 26 x 3⁄4  
  23-559 26 x 0.90  
    26 x 7⁄8  
  25-559 26 x 1.00  
  28-559 26 x 1.10  
  30-559 26 x 1.20  
  32-559 26 x 1.25  
  35-559 26 x 1.35  
  37-559 26 x 1.40  
    26 x 1 5⁄8 x 1 3⁄8  
  40-559 26 x 1.50  
  42-559 26 x 1.60  
  44-559 26 x 1.625  
  44-559 26 x 1.75  
  47-559 26 x 1.75  
    26 x 1.80  
    26 x 1.85  
    26 x 1.90  
  50-559 26 x 2.00  
    26 x 1.90  
    26 x 1.95  
  54-559 26 x 2.10  
    26 x 1.95  
    26 x 2.125  
  57-559 26 x 2.25  
    26 x 2.125  
    26 x 2.20  
  60-559 26 x 2.35  
  62-559 26 x 2.40  
    26 x 2.50  
  64-559 26 x 2.50  
  65-559 26 x 2.60  
  70-559 26 x 2.75  
  75-559 26 x 3.00  
  95-559 26 x 3.70  
    26 x 3.80  
  100-559 26 x 4.00  
  115-559 26 x 4.50  
  120-559 26 x 4.80  
  20-571 26 x 3⁄4  
  23-571 26 x 7⁄8 650 x 23C
  40-571 26 x 1 ½ CS 650 x 38C
    26 x 1 3⁄8 x 1 1⁄2 NL  
  47-571 26 x 1 ¾ 650 x 45C
      650 CS Confort
  54-571 26 x 2 x 1 ¾ 650 x 50C
  20-590 26 x ¾ 650 x 20A
  25-590 26 x 1.00 650 x 25A
  28-590 26 x 1 3⁄8 x 1 1⁄8 650 x 28A
  32-590 26 x 1 3⁄8 x 1 ¼ 650 x 32A
  37-590 26 x 1 3⁄8 650 x 35A
  40-590 26 x 1.50 650 x 38A
    26 x 1 3⁄8 x 1 ½  
  42-590 26 x 1 5⁄8 650 x 40A
  32-597 26 x 1 1⁄4  
27"
  40-609 27 x 1 ½  
  20-630 27 x ¾  
  22-630 27 x 7⁄8  
  25-630 27 x 1.00  
    27 x 1 1⁄16  
  28-630 27 x 1 1⁄8  
  32-630 27 x 1 ¼  
  35-630 27 x 1 3⁄8  
27.5"
  28-584 26 x 1 1⁄8 x 1 1⁄2 650 x 28B
  32-584   650 x 32B
  35-584 27.5 x 1.35 650B
    26 x 1 3⁄8 x 1 1⁄2 650 x 35B
  37-584 27.5 x 1.40 650B
    26 x 1 1⁄2 x 1 3⁄8 650 x 35B
      650 Standard
  40-584 27.5 x 1.50 650B
    26 x 1 5⁄8 x 1 1⁄2 650 x 38B
  44-584 27.5 x 1.65 650B
    26 x 1 5⁄8 x 1 2⁄2 650 x 42B
      650B
Semi-Confort
      650B ½ Ballon
  47-584 27.5 x 1.75 650B
  50-584 27.5 x 2.00 650B
  54-584 27.5 x 2.10 650B
    26 x 1 ½ x 2  
  57-584 27.5 x 2.25 650B
  60-584 27.5 x 2.35 650B
  62-584 27.5 x 2.40 650B
  64-584 27.5 x 2.50 650B
  65-584 27.5 x 2.60 650B
  70-584 27.5 x 2.75 650B
  74-584 27.5 x 2.90 650B
  75-584 27.5 x 3.00 650B
28"
  18-622 28 x ¾ 700 x 18C
  19-622   700 x 19C
      700 x 19
  20-622 28 x ¾ 700 x 20C
  22-622 28 x 7⁄8 700 x 22C
      700 x 22
  23-622 28 x 0.90 700 x 23C
    28 x 7⁄8  
  24-622   700 x 24C
  25-622 28 x 1.00 700 x 25C
    28 x 1 1⁄16  
  26-622   700 x 26C
  28-622 28 x 1.10 700 x 28C
    28 x 1 5⁄8 x 1 1⁄8  
  30-622 28 x 1.20 700 x 30C
  32-622 28 x 1.25 700 x 32C
    28 x 1 5⁄8 x 1 ¼  
  33-622 28 x 1.30 700 x 33C
  35-622 28 x 1.35 700 x 35C
  37-622 28 x 1.40 700 x 35C
    28 x 1 5⁄8 x 1 3⁄8  
  40-622 28 x 1.50 700 x 38C
    28 x 1 5⁄8 x 1 ½  
  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 2.00  
    29 x 2.00  
    28 x 1.90  
  55-622 28 x 2.15  
    29 x 2.15  
  60-622 28 x 2.35  
    29 x 2.35  
  32-635 28 x 1 ½ x 1 1⁄8 770 x 28B
      700 x 28B
      700B Course
  40-635 28 x 1 ½ 700 x 38B
    28 x 1 ½ x 1 5⁄8 700B Standard
  44-635 28 x 1 5⁄8 x 1 ½ 700 x 42B
  28-642 28 x 1 5⁄8 x 1 ½ 700 x 28A
  37-642 28 x 1 3⁄8 700 x 35A
29"
  50-622 29 x 2.00  
    28 x 2.00  
  54-622 29 x 2.10  
    28 x 2.10  
  55-622 29 x 2.15  
    28 x 2.15  
  56-622 29 x 2.20  
  57-622 29 x 2.25  
  60-622 29 x 2.35  
    28 x 2.35  
  75-622 29 x 3.00  

The marking of tires and tubes may slightly vary depending on the manufacturer.

 

 

Orientation table of compatible rim and tire widths:

Tube width Internal rim width
mm inches mm
13-14,9 15-16,9 17-17,9 18-19,9 20-22,9 23-24,9 25-27,9 28-32,9 33-38,9 39-50,9 51-65,9 66
20 0.80                        
23 0.90                        
25 1.00                        
28 1.10                        
30 1.20                        
32 1.25                        
34 1.35                        
36 1.40                        
38 1.50                        
41 1.60                        
43 1.70                        
47 1.85                        
50 1.95                        
52 2.05                        
53 2.10                        
56 2.20                        
60 2.35                        
64 2.50                        
66 2.60                        
69 2.70                        
71 2.80                        
74 2.90                        
76 3.00                        
81 3.20                        
89 3.50                        
102 4.00                        
107 4.20                        
114 4.50                        
122 4.80                        
127 5.00                        

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