First bike with pneumatic tires ridden off road1887
In 1887, Irish veterinary surgeon John B. Dunlop fitted a piece of rubber hose to his son’s bicycle. The superior air suspension this provided over solid tires led to world-wide acceptance by 1891. Tire sizes were commonly 30 x 1.5″ and 28 x 1.5″. No doubt, bikes with these tires were ridden on dirt, as there were few paved roads.