For this age group, the frame material is critical; high-carbon steel offers durability for beginners, while aluminum alloy provides a lightweight alternative for easier handling. The wheel size should typically be 12, 14, or 16 inches depending on the child's height. Ensure the bike features sealed bearings in the hubs and bottom bracket to prevent dust entry and ensure a smooth ride. Additionally, reinforced handlebars with a 360-degree rotor system (if intended for stunts) and wide, high-traction tires (2.125" or wider) are essential for stability and shock absorption.