How Ball Bearings Work in Roller Skates - Engineering Diagram #25549 (License: Personal Use)

The image presents a black-and-white technical schematic of a quad roller skate, emphasizing its wheel assembly and the critical role of ball bearings. On the right, an enlarged cross-sectional view reveals the inner race, outer race, and individual steel balls housed within a retainer-highlighted by an arrow and label “BALL BEARING.” This visual explains how rotational friction is minimized to ensure efficient motion.

Used in educational content, mechanical engineering guides, or product documentation for skate manufacturing and maintenance. Matches user intent for understanding component function, DIY repair, or physics demonstrations.