Anthony Graupera
If you don't have any luck off chat responses and assuming you don't speak French, search "location velo". Better yet, if you go to the French version of whatever search engine you choose (like yahoo.fr) you might get lucky. I never knew of any shops that rented racing-type bikes around Paris (used to live near by), only city cruisers. The Ventoux link might be one of a handful of such places in the entire country. If you see rentals for "VTT" (velo tout terrain), those are mountain bikes. I poked around a bit and easily found VTT rentals in Chamonix www.chamonix.net/francais/vtt/vtt.htm. Maybe they can help you find roadbikes if you contact them. Good luck with it.