The "Spring Classics" refer to a series of prestigious one-day cycling races held in Europe during the spring months, primarily in March and April. These races are known for their challenging routes, often featuring cobblestones, hills, and unpredictable weather. Notable events include the Tour of Flanders and Paris-Roubaix, which attract top professional cyclists from around the world. These races are part of the UCI World Tour and are highly regarded for their history and tradition. They test riders' endurance and skill, making them a key part of the cycling calendar. Winning a Spring Classic is considered a significant achievement in the sport.