I found this article on Trove:
http://nla.gov.au/nla.news-article16323530" onclick="window.open(this.href);return false;
CYCLING
PICTON TO ENFIELD
GOULD'S BRILLIANT RECORD
In the Picton to Enfield open road race, promoted by Marrickville Amateur Club, on Saturday afternoon, 79 riders competed. J. L. Gould performed one of the finest feats on record in a race of this length by covering the 45 miles in 1 hour 49 minutes 39 3-5 seconds. He averaged 25 miles an hour.
The race was run under favourable conditions this year, as improvements have been effected which provide almost perfect roads for about 40 out of the 45 miles. Gould and N. Gillroy, holder of the individual amateur road championship of Now South Wales, who started from scratch, were allowing up to 28 minutes in starts, but, although they failed to finish amongst the placed men, easily did the fastest and second fastest times.
Under 1h50m for 45 miles on a 1920s spec. bicycle on 1920s spec. roads.
Anyone here got a Strava link to a 70km bike ride where they averaged more than 39km/h?