Wave-forming on the sides of tyres is a normal phenomenon with radial tyres. This is merely an aesthetic issue, which has no impact on the tyre’s performance. How visible these waves are will be determined by the height/width ratio of the tyres and signs will be more visible at a higher tyre pressure. However, should you encounter bumps on the side of the tyre, you should visit an Aeolus dealer for an inspection. Look here for your nearest Aeolus dealer.