Cycling has originally been considered a sport for working-class people, mainly because it was practised by people belonging to the lower classes; even so, bicycles, at that time, were an extremely expensive and rare good if related to the general wealth people experienced. Although, nowadays those premature examples seem to be fairly basic and primitive if compared to the standards that the market has reached. Indeed, modern bicycles are becoming more and more refined and complex products, especially in recent years. Bikes underwent an incredible development in geometries, technical solutions and materials, and so did components in general. Historically, steel was the material of choice for frames production, and so it remained for almost one entire century, until aluminum alloys frames started to show up in later 90s and beginning of the new millennium.