| Width | Aspect | Wheel | Diameter | Section Width |
|---|---|---|---|---|
| 205 | 70 | 15 | 26.3 | 8.1 |
| 245 | 70 | 15 | 28.5 | 9.6 |
| 205 | 75 | 15 | 27.1 | 8.1 |
| 215 | 75 | 15 | 27.7 | 8.5 |
| 225 | 75 | 15 | 28.3 | 8.9 |
| 235 | 75 | 15 | 28.9 | 9.3 |
| 245 | 75 | 15 | 29.5 | 9.6 |
| 265 | 75 | 15 | 30.6 | 10.4 |
| 215 | 85 | 15 | 29.4 | 8.5 |
| 245 | 85 | 15 | 31.4 | 9.6 |
| 275 | 85 | 15 | 33.4 | 10.8 |
| 315 | 85 | 15 | 36.1 | 12.4 |
| 325 | 60 | 15 | 30.4 | 12.8 |
| Width | Aspect | Wheel | Diameter | Section Width |
|---|---|---|---|---|
| 305 | 65 | 16 | 31.6 | 12.0 |
| 345 | 65 | 16 | 33.7 | 13.6 |
| 245 | 70 | 16 | 29.5 | 9.6 |
| 255 | 70 | 16 | 30.1 | 10.0 |
| 305 | 70 | 16 | 32.8 | 12.0 |
| 225 | 75 | 16 | 29.3 | 8.9 |
| 245 | 75 | 16 | 30.5 | 9.6 |
| 265 | 75 | 16 | 31.6 | 10.4 |
| 285 | 75 | 16 | 32.8 | 11.2 |
| 295 | 75 | 16 | 33.3 | 11.6 |
| 315 | 75 | 16 | 34.5 | 12.3 |
| 215 | 85 | 16 | 30.4 | 8.5 |
| 235 | 85 | 16 | 31.7 | 9.3 |
| 255 | 85 | 16 | 33.1 | 10.0 |
| 265 | 85 | 16 | 33.7 | 10.4 |
| 305 | 85 | 16 | 36.4 | 12.0 |
The above numbers are computed values and some rounding has been done on the computed values. The actual tire sizes can and will vary depending on the tire manufacturer.
For another example of a tire cross reference chart, see Tireracks Diameter Comparison Chart
To compute the values in the table above, use the formula of:
HEIGHT = ((width * aspect-ratio * 2) / 2550) + rim size
WIDTH = (width / 25.50 )
For example, a 235/75R15 tire is ((235*75*2)/2550)+15) = 28.8 inches of tire height. The tire width is figured by 235/25.5 = 9.21
Metric tire sizes are stated as three numbers. The way it reads is:
width / aspect ratio R tire rim size
235 / 75 R 15