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MTB Tyre Size Guide
This chart was created by summarising existing information on the net. Tyre manufacturers may have different standards and we cannot guarantee the information below to any specific tyre.
The Acceptable Tyre width can be used to check what tyre width will most likely fit on your rim.
The Ideal Tyre width is a bit more conservative.
| Rim Inner Width (mm) | Ideal Tyre Width Range (in) | Acceptable Tyre Width Range (in) |
|---|---|---|
| 19 | 1.5 - 1.9 | 1.5 - 2.125 |
| 21 | 1.5 - 2.1 | 1.4 - 2.4 |
| 23 | 1.6 - 2.4 | 1.5 - 2.75 |
| 25 | 1.6 - 2.75 | 1.5 - 2.95 |
| 27 | 1.9 - 2.95 | 1.6 - 3.15 |
| 29 | 2 - 3.15 | 1.9 - 3.25 |
| 31 | 2.1 - 3.25 | 2 - 3.4 |
| 33 | 2.25 - 3.3 | 2.1 - 3.5 |