I recently read about the Raliegh/Sturmey-Archer team of the pre-war years. They used various S-A hub gears to set their records, including some pretty good average speeds (as high as 27 mph over a 25 mile course, I believe. But I will post a link to the article by Peter Kohler).
That’s pretty impressive for a three speed hub. Are hub gears allowed in modern time trials?
ipernity: Raleigh/Sturmey-Archer Team 1936-40 by Peter Kohler