2.38.2. "Secondary grooves" means the supplementary grooves of the tread pattern which may disappear in the course of the tyre's life. a7c0
2.35.2. "Secondary grooves" means the supplementary grooves of the tread pattern which may disappear in the course of the tyre's life. a4c0
2.32.2. "Secondary grooves" means the supplementary grooves of the tread pattern which may disappear in the course of the tyre's life. a3c0
2.30.2. "Secondary grooves" means the supplementary grooves of the tread pattern which may disappear in the course of the tyre's life. a0c0