Bike Inner Tube Sizes Chart
Quick answer: match the tire tube to the exact ETRTO diameter printed on your tire, then choose a tube range that includes the tire width. For example, a 37-622 tire needs a 622 mm tube sized for 37 mm width. Do not choose by “26 inch” or another inch label alone: the same label can describe different wheel diameters.
Examples of Tire and Tube Size Ranges
In ETRTO sizing, the first number is nominal tire width in millimeters and the second is the bead-seat diameter. The table shows examples from Continental’s tube range; brands may print ranges differently, so check the tube package and the tire maker’s sizing information.
| Tire ETRTO range | Example tube range | Typical tire use |
|---|---|---|
| 20-622 to 25-622 | 20-622 to 25-630 | Narrow road tires |
| 25-622 to 32-622 | 25-622 to 32-630 | Road and endurance |
| 32-622 to 47-622 | 32-622 to 47-622 | Hybrid, cyclocross, and gravel |
| 47-622 to 62-622 | 47-622 to 62-622 | 29-inch mountain tires |
| 47-559 to 62-559 | 47-559 to 62-559 | 26-inch mountain tires |
| 47-584 to 62-584 | 47-584 to 62-584 | 27.5-inch / 650B mountain tires |
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Why the Inch Label Is Not Enough
Traditional inch names are not a precise wheel-fit standard. Use the ETRTO diameter instead; this cross-reference shows why.
| Common size label | ETRTO diameter(s) | What to check |
|---|---|---|
| 20 in | 406, 419, or 451 mm | Check the full tire marking; these diameters are not interchangeable. |
| 24 in | 507, 520, 540, or 547 mm | The inch label alone does not identify the rim diameter. |
| 26 in | 559, 571, 590, or 597 mm | 559 mm is common for MTB; 571, 590, and 597 mm are other standards. |
| 27.5 in / 650B | 584 mm | Commonly the same bead-seat diameter. |
| 700C | 622 mm | Match the 622 mm value on the tire and tube. |
| 29 in | 622 mm | Shares 622 mm bead-seat diameter with 700C; width range must still match. |
| 27 in | 630 mm | Older road size; do not confuse with 700C / 622 mm. |
| 28 in | 622 or 635 mm | Use the ETRTO number; the inch name is ambiguous. |
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Check Width, Valve, and Stem Length
- Read both numbers of the tire’s ETRTO marking, often printed beside the inch or French size.
- Choose a tube whose listed diameter includes the tire’s bead-seat diameter and whose width range includes the tire width.
- Match the valve to the rim hole and pump: Presta, Schrader, or Dunlop/Woods where available.
- For deep-section rims, choose a valve stem long enough to extend past the rim and accept your pump head.
- Do not stretch a tube beyond its marked range. If the sidewall marking is missing or unclear, take the tire or wheel to a bike shop.
Use Schwalbe’s tube finder by entering the tire size and valve type, or compare the exact ETRTO marking with your tube manufacturer’s current chart.
For the standards behind the chart, see Schwalbe’s explanation of tire size designations, Continental’s tube range chart, and Park Tool’s tire and tube fit guide.
