"monthly magazine": 25 or 24 editions per year in the 1940s and 50s, 11 per year in the 1960s, 10 per year 1970sThat's nice! It was a monthly magazine for mostly cycle tourists and randoneeurs. They featured race bikes also but their focus was predominantly touring and fast tourers. Rebour was initially employed just as a lowly, badly paid illustrator but became I suppose a sort of partner in the business because of the quality of his work (and the necessity).
"focus touring bikes": First and foremost, it was an trade magazine, it reported what the trade was interested in. Reporting on developments in bicycle technology was only one part, albeit an important one. Focus was on cycletouring in the 1940s, motorized twowheelers in the 1950s (from about 1953) and race bike technology from 1960s onwards.
"badly paid" I am really really interested in a reference to this factual assertion. I have spent hundreds of hours researching Rebour's life and work. Nowhere could I find any indication that his work was “lowly, badly paid” after the war.
The only thing that can be found is a guess by Raimond Henry 1995 “His salery could not have been much, though, during the period straight after the war” Just a guess, not a fact. But facts can be found elsewhere, in Heine's Herse book: Rebour bought 6 Rene Herse bicycles within 3 years at the end of the 1940s. Everyone can draw their own conclusions about his salary at the time.
"Employed as a illustrator" He was employed as an editor. His first work were articles and some humourous drawings, technical illustrations started little later. From 1960 onwards he was editor in chief, never publisher or partner of "Le Cycle".
Van der Plas' Rebour book is sort of a mediocre reference. It has too many errors, still after the fifth or so revised edition.