Urgent replacementReading the size off the sidewall
Getting the right tyre starts with the size printed on the side, a string such as 225/45 R17 94W. That is the width in millimetres, the sidewall height as a percentage of the width, R for radial, the wheel diameter in inches, then the load index and speed rating. If the damaged tyre is hard to read, use the one on the other side of the same axle, which should match.
Also tell us if the tyre is a run-flat (marked with letters such as RSC, ROF, RFT or SSR) or carries a car maker's approval mark, such as a star for BMW or MO for Mercedes-Benz, so we can match it.