Example: 235/45R18 98Y — width/profile/construction/rim, then load index (98) and speed symbol (Y).
Key markings
- Size: 235/45R18 = 235 mm width, 45% aspect, radial, 18” rim.
- Load index: a number that corresponds to a maximum load per tyre.
- Speed symbol: a letter indicating the maximum speed capability when correctly inflated and loaded.
- Other: manufacture date (DOT week/year), rotation direction (if directional), and extra marks like XL.
Safety: Always meet or exceed the vehicle placard’s load & speed ratings.