Its obvious that the boom in cycling was an aftershock of the huge success of Sir Wiggins winning the 2012 Tour and the massive success of the Olympics. While Chris Froome was dragging Bradley up the Peyragude you wouldn’t have spotted a steel bike in sight. Rewind 20 years and using the “dream material” of carbon fibre would have been but a distant thought.
Standing a modern bike next to an older frame and 2 things become really apparent. Visually the shape hasn’t changed much, tube shapes have changed dramatically, but where the pipes meet hasn’t. The other noticeable difference would be weight. These days we are adding bits of to make the UCI 6.8kg weight limit. Throwback to the days of Hinaut and “Big Ted” and they would have dreamed of a bike so light.