Quote Originally Posted by JohnH View Post
As the picture shows there’s a line in the centre of the face of the tyre which sits slightly proud of the adjacent surface. Can anyone tell me what it means, please?
It's a silica free band of “antenna tread” which actually helps to dissipate the static electricity as you drive (the problem with silica is it’s a very good electrical isolator. Silica rich compounds build up a static electrical charge as you drive. On occasion this can be enough to give you a small electrical shock as you exit the vehicle and your foot hits the ground, giving the electrical charge a route to earth)