Paris–Roubaix is a one-day professional bicycle road race in northern France, starting north of Paris and finishing in Roubaix, at the border with Belgium. It is one of cycling's oldest races, and is one of the 'Monuments' or classics of the European calendar, and contributes points towards the UCI World Ranking.

A sett, also known as a block or Belgian block, is a broadly rectangular quarried stone used in paving roads and walkways. Formerly in widespread use, particularly on steeper streets because setts provided horses' hooves with better grip than a smooth surface, they are now encountered rather as decorative stone paving in landscape architecture. Setts are often referred to as "cobblestones", although a sett is distinct from a cobblestone in that it is quarried or worked to a regular shape, whereas the latter is generally a small, naturally-rounded rock. Setts are usually made of granite.