Abstract: A method of building a sequence of tyres different from each other, includes generating a first deposition surface by a first series of consecutive circumferential sectors. The first deposition surface is selected as a function of the type of a first tyre to be built. Each circumferential sector of the first series is removably coupled to a central body of a forming drum. The method further includes manufacturing at least one component of the at least one first tyre by deposition of the at least one component at a radially external position to the first deposition surface of the forming drum, removing the at least one component from the forming drum and replacing each circumferential sector of the first series with a circumferential sector of a second series for generating a second deposition surface selected as a function of the type of a second tyre to be built which is different from the first tyre.