Plant for producing tyres for vehicle wheels

A plant for producing tyres for vehicle wheels, comprising a building line configured to build a crown structure, wherein said building line comprises a building device configured to build a belt assembly, wherein said building device comprises:

• a trolley moveable along a first direction of movement;
• a substantially cylindrical first forming drum configured to be coupled with said trolley;
• a contractable/expandable second forming drum configured to assume a substantially toroidal shaping and configured to be coupled with said trolley;
• a first working area comprising a belt building device configured to build a crossed belt structure;
• a second working area arranged downstream of said first working area with respect to said first direction of movement and comprising a depositing device configured to deposit at least one zero degrees belt layer in a radially outer position with respect to said crossed belt structure;
• a first service area arranged downstream of said second working area with respect to said first direction of movement and comprising a stationary annular holding member configured to receive said crossed belt structure from said first forming drum;
• and
• a second service area arranged downstream of said first service area with respect to said first direction of movement and comprising a first support member, said first support member configured to receive said first forming drum.