One image, amongst so many, stands out is this image from the 1985 mud bath. I remember watching CBS Sports' dramatic imagery and the overly-dramatic John Tesh saying, 'Kelly... wearing his goatee of firth, which he has become famous." Memorable for sure.
Also memorable was the weather; just plain wet turning the narrow roads muddy and slick. Sean Kelly famously said, "A Paris-Roubaix without rain is not a true Paris-Roubaix. Throw in a little snow as well, it's not serious."
We associate Paris-Roubaix with the rain, the additional difficulty created by the rain that draws us to it.
Appropriately called... L'Enfer du Nord.