The Tecno-4 Iron is a closure mechanism developed by Sidi for its high-performance cycling shoes. It represents the latest evolution in Sidi's dial-based systems, offering enhanced ergonomics, adjustability, and durability. - The Tecno-4 dial lifts away from the shoe tongue, creating more space for the foot to slide in easily - The rotor has been redesigned to be lighter and quicker to operate than previous Tecno systems - The central mechanism balances tension across the shoe, adapting to various instep shapes for a secure and comfortable fit