The central idea of this article is the bicycles where Ansell are in important military devise how to speed up to support the central idea

What article are you talking about? I guess you need to check it first and be more detailed. The central idea is the central, unifying element of the story, which ties together all of the other elements of fiction used by the author to tell the story. The central idea can be best described as the dominant impression or the universal, generic truth found in the story. A paragraph contains facts, statements, examples-specifics which guide us to a full understanding of the main idea. They clarify, illuminate, explain, describe, expand and illustrate the main idea and are supporting details.