Before Stelio Belletti focused on road bicycles, his family workshop in Milan made specialised metal structures, including work for aircraft and racing motorcycles. Belletti was also a cyclist who wanted a frame that matched his ideas about precise construction. When a purchased bicycle disappointed him, the tools and skills to attempt his own frame were already close at hand.
In the early 1970s, lugged joints were familiar territory for steel road frames. Belletti chose TIG welding, a method he knew from other metalwork. It allowed a frame without traditional lugs and opened a different way to think about tube junctions. After several iterations, the result drew the attention of other riders; the Stelbel name was registered in 1973.
In 1975 Belletti formalised his lugless Integrale frame design in a patent. The workshop later explored different tubing, forks and frame shapes, while steel and the quality of its welds remained central to its identity. The brand ceased operations in 1990 and returned in 2015. Its history shows how a change in bicycle design can begin where skills from another craft meet a rider’s persistent question.