Sidi Tecno 4 Iron 230mm System Pair - BlackSidi Tecno 4 Iron 230mm System Pair Black. The Tecno 4 Iron is a closure mechanism developed by Sidi for its high performance cycling shoes. It represents the latest evolution in Sidis 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
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