Cinelli was the seventh of 10 children, the son of a small landowner near Florence. He became interested in bicycle technology after mechanical failures in races. Failure to interest manufacturers with his ideas in 1946 led him to start his own company. His brother Giotto was making steel stems and bars in Florence and Cinelli moved the business to Milan, centre of the Italian cycling industry. He made stems, bars and frames but depended on wholesaling for other companies. By his retirement, Cinelli's own goods were half the business. Stems and bars were 80 percent of Cinelli's own sales.