Bicycle Tube Size Finder
Find the tube that fits your tire. Use the calculator below. Results update as you type.
How the Bicycle Tube Size Finder Works
This finder works by matching your tire's BSD and width to the width range printed on a tube's label. One tube covers a range of widths on one BSD.
- Enter the tire size, for example 700x32c (32-622).
- Read the matching tube range: 700 x 25–32c.
- Choose the valve type: Presta or Schrader.
- Choose a valve length that clears the rim depth.
The Formula
The formula is Match = (Tube BSD = Tire BSD) AND (Tube Min Width ≤ Tire Width ≤ Tube Max Width).
Match = BSD equal AND W_min ≤ W_tire ≤ W_max Valve Length ≥ Rim Depth + 15 mmWorked example: a 27.5 x 2.4 tire (61-584) matches a 27.5 x 2.1–2.6 tube (54/66-584). A 40 mm deep rim needs a valve at least 55 mm long.
Conversion Table
The conversion table lists typical tube ranges for 8 wheel sizes with ETRTO ranges and valve options. Ranges cover road, gravel, mountain, junior and BMX wheels.
The note under the table states that each tube maker prints its own exact range.
| Wheel | Tube Range (inch / mm) | ETRTO Range | Valve Options |
|---|---|---|---|
| 700C road | 700 x 18–25c | 18/25-622 | Presta 48 / 60 / 80 mm |
| 700C wide road | 700 x 25–32c | 25/32-622 | Presta 48 / 60 mm |
| 700C gravel | 700 x 35–45c | 35/45-622 | Presta / Schrader |
| 29 in MTB | 29 x 2.1–2.6 | 54/66-622 | Presta / Schrader |
| 27.5 in MTB | 27.5 x 2.1–2.6 | 54/66-584 | Presta / Schrader |
| 26 in MTB | 26 x 1.75–2.125 | 47/57-559 | Presta / Schrader |
| 24 in junior | 24 x 1.75–2.125 | 47/57-507 | Schrader |
| 20 in BMX | 20 x 1.75–2.125 | 47/57-406 | Schrader |
Typical ranges; each tube maker prints its own range on the box.
What Is the Bicycle Tube Size Finder?
The Bicycle Tube Size Finder is a tool that picks an inner tube that fits a tire's diameter and width. Tubes stretch, so one size covers several tire widths.
A tube too narrow for the tire stretches thin and punctures more. A tube too wide folds inside the tire and pinches during fitting.
Common Uses
This finder has 4 uses: spare-tube shopping, valve selection, kids' bikes and touring kits.
- Buy spare tubes: Match the range to your tire.
- Choose valves: Pick valve type and length.
- Fit kids' bikes: Find tubes for 20 in and 24 in wheels.
- Pack touring kits: Carry one tube that fits both wheels.