Worn down tread. If your tyre’s tread pattern is slowly disappearing, and your tire is starting to lose grip/starting to look like a slick, it could be time to replace your tyre. Cracked rubber. If the rubber on the tread strip starts cracking. Continuous flats may indicate that the tyre is at the end of its lifecycle. If there are any nicks or cuts in the tyre. Bubbles and deformities. If you see unusual shapes around your tyre. Mileage. Depending on the model and how you have looked after your tyre, it could be time to replace your tyre. When the puncture protection belt or carcass threads can be seen through the tread of the tyre, the tire has reached its wear limit. In general, a Corsa should be replaced between 3000-5000 kilometres depending on how you’ve looked after it.