The youngest motocross class is typically called "50cc" or "50cc Mini". This class is designed for riders who are just starting out in motocross and are usually between the ages of 4 and 7.
Riders in this class compete on small, 50cc motorcycles, which are specifically designed for younger riders. These bikes have smaller engines, lower seat heights, and lighter frames, making them easier for young riders to control.
The 50cc class is a great way for young riders to learn the basics of motocross, including how to start, shift gears, and navigate the track.
It also helps them develop their riding skills and build their confidence.