Road bicycle racing is a sport where people ride bicycles really fast on roads. They usually wear special clothes to help them go faster and use special bikes that are very light and have skinny tires. The people who race are called cyclists.
The race starts with all the cyclists at the same place and they ride together on a course that can be very long, sometimes hundreds of miles! The cyclist who gets to the finish line first is the winner of the race.
But there are different kinds of races within road bicycle racing. Some are shorter and faster, and some have big mountains that the cyclists have to go up and down. These races can last for days and are called stage races.
The cyclists have to be really good at riding their bikes because they have to go super fast, but they also have to be really good at planning their strategy. That means they have to think about when to go fast and when to slow down, when to stay with the group or when to try to get ahead.
It's a very exciting sport to watch because you never know who is going to win until the very end, and the cyclists have to work hard together or against each other to get there.