Input (grade 4): Sport Roubaix is the finish of the Paris-Roubaix cycling classic from Compiègne to Roubaix over 259.5 km, which includes almost 50 km of cobbles.
Output (grade 5): The city is well-known for its cycling race Paris-Roubaix which is over 259.5 km and includes almost 50 km of cobblestone sections.