Frame geometry refers to the specific measurements and angles that define the shape and structure of a bicycle frame. Key elements include the length of the top tube, seat tube, and chainstays, as well as the angles of the head tube and seat tube. These dimensions influence the bike's handling, comfort, and overall performance. Different types of bicycles, such as road bikes, mountain bikes, and hybrid bikes, have distinct frame geometries tailored to their intended use. For example, a road bike typically has a more aggressive geometry for speed, while a mountain bike features a more relaxed geometry for stability on rough terrain.