Method for producing a vehicle tyre with a tyre carcass, tyre beads with cores, a tyre breaker belt and a tread, comprising the following steps: a) providing a tyre building drum for the production of a green tyre, b) providing a tyre inner core at the tyre building drum, c) placing and winding the tyre inner core onto the tyre building drum, the ends of the material of the tyre inner core being joined together by a lap splice on the tyre building drum, d) cutting to length and providing a carcass ply by a conveying means, e) determining the length of the material of the carcass ply by a sensor, f) comparing the actual value of the length of the material of the carcass ply with a setpoint value, it subsequently being checked by a control algorithm whether intervention is required after step g) at the controller of the tyre building drum, g) adapting the diameter of the drum to a deviation in the length of the measured carcass ply, the diameter of the drum being set such that, after the winding of the carcass ply on the tyre building drum, a defined lap splice with a prescribed material overlap is achieved, the diameter of the drum being set such that, after the splicing together, three reinforcing elements are respectively arranged in the front and rear end regions (4, 5), and the tyre building drum being expanded by 0.1 to 1%, preferably 0.2 to 0.6%, the expansion relating to the original diameter of the drum with the wound-on tyre inner core, h) placing and winding the carcass ply onto the tyre building drum, i) splicing together the two ends of the material (4, 5) of the carcass ply on the tyre building drum, the two ends of the material (4, 5) being joined together with a defined lap splice, j) placing and winding further tyre components onto the tyre building drum, k) completing the vehicle tyre by further steps. a) providing a tyre building drum for the production of a green tyre, b) providing a tyre inner core at the tyre building drum, c) placing and winding the tyre inner core onto the tyre building drum, the ends of the material of the tyre inner core being joined together by a lap splice on the tyre building drum, d) cutting to length and providing a carcass ply by a conveying means, e) determining the length of the material of the carcass ply by a sensor, f) comparing the actual value of the length of the material of the carcass ply with a setpoint value, it subsequently being checked by a control algorithm whether intervention is required after step g) at the controller of the tyre building drum, g) adapting the diameter of the drum to a deviation in the length of the measured carcass ply, the diameter of the drum being set such that, after the winding of the carcass ply on the tyre building drum, a defined lap splice with a prescribed material overlap is achieved, the diameter of the drum being set such that, after the splicing together, three reinforcing elements are respectively arranged in the front and rear end regions (4, 5), and the tyre building drum being expanded by 0.1 to 1%, preferably 0.2 to 0.6%, the expansion relating to the original diameter of the drum with the wound-on tyre inner core, the diameter of the drum being set such that, after the winding of the carcass ply on the tyre building drum, a defined lap splice with a prescribed material overlap is achieved, the diameter of the drum being set such that, after the splicing together, three reinforcing elements are respectively arranged in the front and rear end regions (4, 5), and the tyre building drum being expanded by 0.1 to 1%, preferably 0.2 to 0.6%, the expansion relating to the original diameter of the drum with the wound-on tyre inner core, h) placing and winding the carcass ply onto the tyre building drum, i) splicing together the two ends of the material (4, 5) of the carcass ply on the tyre building drum, the two ends of the material (4, 5) being joined together with a defined lap splice, j) placing and winding further tyre components onto the tyre building drum, k) completing the vehicle tyre by further steps.