Colnago C40 B-STAY is considered a revolutionary model that marked the transition from steel to carbon fiber in professional racing bikes. It was the first full carbon frame to win Paris-Roubaix, a brutal cobbled classic, which cemented its reputation for durability, performance, and comfort! & it’s in great condition! Frame & Construction 56cm. Material: Full carbon fiber (lugged construction). Design: The C40 uses a lugged frame design, where carbon tubes are bonded into carbon lugs-a nod to traditional steel frame-building techniques, but executed entirely in carbon. Handmade in Italy: Each frame was hand-built in Colnago’s Cambiago factory. Groupset: Campagnolo Record carbon. Wheelset: Campagnolo NUCLEON Original Colnago ITM stem included!