The course can be modified due to route changes of the professional race.
The ultimate challenge is to ride the 170k from Busigny to Roubaix, on the same course as the pros will do the day after. However, the routes of 141k and 70k will also leave you plenty of opportunity to get to know the tough cobblestone sections of the mythical Paris-Roubaix race.
The numbering of the varying cobble stone sections is identical to the numbering in the elite race. Some consecutive sections have the same number.