Originally, SEDIS essentially focused on manufacturing chains for cars and bicycles. It was at the beginning of the fifties that it adapted the chromizing process, used in the aeronautical sector, to smaller chains. This revolution, still manufactured today under the DELTA® brand name, makes it possible to endow chains with greater resistance to wear. This contributed to making SEDIS bicycle chains the key element for victory, because they were used by the greatest cycling champions – including Louison Bobet who SEDIS sponsored in 1955 – reaching their peak in the early seventies when SEDIS equipped the bicycles of 10 out of 11 teams on the Tour de France!
This activity was then sold by SEDIS in 1987, but the DELTA® process continued to evolve allowing it to be used on larger chains, enabling SEDIS to propose an extensive range of chains with extremely high-performance mechanical characteristics.