Method for building tyres

A method for building tyres comprising:

• building a carcass sleeve and a crown structure of each tyre in sequence relative to each other, wherein the sequence comprises:
• arranging an expandable toroidal forming drum having a radially external toroidal surface configured for contacting a radially inner surface of the carcass sleeve;
• positioning the carcass sleeve at a radially external position relative to the expandable toroidal forming drum and spaced from the expandable toroidal forming drum;
• shaping the carcass sleeve as a toroid until reaching a maximum carcass sleeve diameter at the radially inner surface of the carcass sleeve, while said forming drum is positioned inside, and spaced from, the carcass sleeve;
• expanding the expandable toroidal forming drum to form an expanded toroidal forming drum remaining spaced from the carcass sleeve and exhibiting a maximum forming drum diameter;
• radially contracting the carcass sleeve shaped as a toroid for subsequently contacting the radially internal surface of the carcass sleeve to the expanded toroidal forming drum;
• and
• building the crown structure directly on a radially external surface of the carcass sleeve shaped as a toroid and contacted with the expanded toroidal forming drum.