Tuesday, October 11, 2011
Cross Cyclo-pédestre, February 18th 1930, Paris
"Remember, racers still didnt trust the derailleur even into the 1940s, and that held for cyclocross as well - bikes were largely single-speed, often with a fixed wheel. Brakes were still largely sidepulls at this time as well."
From here, and there are many more awesome pics there too.