No tire on any vehicle moved on the paved streets within the city shall have on its periphery any block, stub, flange, cleat or spike or any other protuberance of any material other than rubber which projects beyond the tread of the track surface of the tire, except that it shall be permissible to use farm machinery with movable wheels which will not injure the paved streets of the city and except also that it shall be permissible to use tire chains of reasonable proportion upon any vehicle when required for safety because of snow, ice or other conditions tending to cause skidding. (Ord. 215 § 3, 1965)