195 or 205: unladen tyre width in mm.
65, 60, 55: The ratio of the tire height to its width = 65: 100, 60: 100 or 55: 100. Old radial tires, which are no longer installed on the Audi A4, have a tire height to its width ratio of 80: 100. Accordingly, the ratio of the height to width is lower in tires designated 65, 60 and 55.
- 1. max load
- 2. internal pressure
- 3. layers
- 4. side wall
- 5. protector
- 6. DOT check*
- 7. manufacturer code
- 8. tire size code
- 9. tire type code (optional, in-house)
- 10. week of production
- 11th year
- 12. radial
- 13. tubeless
- 14. nominal width
- 15. cross-sectional ratio
- 16. radial
- 17. rim diameter
- 18. load index or characteristic
- 19. speed index
- 20. ECE quality mark* (approval mark with country code, eg 3 - Italy)
- 21. admission number
- * DOT - Department of Transportation
- * ECE - EEC - Economic Commission for Europe
All the symbols you will find on the sidewall of the tire are explained here.
- R: designation of the tire construction as radial.
- 15: The inner diameter of the tire in inches.
- 90 or 91: designation of load-bearing capacity.
- Q: Permissible maximum speed up to 160 km/h - speed class for conventional tires M + S.
- S: maximum speed up to 180 km/h.
- T: maximum speed up to 190 km/h - maximum speed for M + S tires.
- H: up to 210 km/h.
- V: up to 240 km/h.
- W: up to 270 km/h.
- Z: over 270 km/h.