This tire size reference table shows the overall diameter for a range of tyre width values, assuming an aspect ratio of 55 % and a rim diameter of 16 in. Every figure is computed with the same engine that powers our Tire Size Calculator, so the numbers are exact.
| Tyre width | Overall diameter | Sidewall height |
|---|---|---|
| 51 mm | 18.21 | 28.1 |
| 100 mm | 20.33 | 55.0 |
| 150 mm | 22.50 | 82.5 |
| 210 mm | 25.09 | 115.5 |
| 310 mm | 29.43 | 170.5 |
| 410 mm | 33.76 | 225.5 |
| 620 mm | 42.85 | 341.0 |
| 1,000 mm | 59.31 | 550.0 |
| 1,400 mm | 76.63 | 770.0 |
| 2,100 mm | 106.94 | 1,155.0 |
How to use this table
Find the row closest to your tyre width and read across to the overall diameter. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Tire Size Calculator for a precise answer.
Need a value that is not in the table? — the Tire Size Calculator does it instantly, for free, with the formula and a worked example built in.
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