TYRE PART NUMBER EXPLAINED
| Number Examples: | Explanation |
| 195/50 R 15 86 H | 1) Tyre width in millimeters |
| 215/45 Z R 17 | 2) Tyre aspect ratio (percentage of tyre width) |
| 165 S R 13 | 3) R = Radial construction |
| 31 x 10.50 R 15 6PR | 4) Tyre diameter (also known as applicable rim diameter) |
| 220/55 R 390 | 5) Load index |
| 6) Speed symbol | |
| 7) Tyre outer diameter in inches | |
| 8) Tyre rating (tyre structure-ply rating) | |
| 9) Tyre internal diameter in millimeters (millimetric tyres only) |