Multi-segment roller for use as an application roller in a tyre-building machine, having a carrier structure which comprises: a) a main body comprising: i) a fluid-guiding cutout, ii) five or more piston cutouts, which are respectively connected in a fluid-conducting manner to the fluid-guiding cutout, and iii) three or more fluid inlets (22a-c), which are respectively connected in a fluid-conducting manner to the fluid-guiding cutout, b) five or more pistons, which are respectively arranged in the piston cutouts in such a way that, as a result of a pressure increase in the fluid-guiding cutout, they are able to perform a stroke movement, and c) five or more carrier plates, which respectively have an inner clearance, wherein the main body extends through the inner clearances of the carrier plates in such a way that the carrier plates are respectively arranged at the height of at least one piston cutout, wherein the inner clearances are dimensioned such that the position of the carrier plates relative to the main body can be respectively changed by the stroke movement of at least one of the pistons, wherein the multi-segment roller comprises in the fluid-guiding cutout two or more sealing elements (30a, 30b) for fluid-tight sealing of the fluid-guiding cutout, by way of which sealing elements the fluid-guiding cutout is subdivided into three or more mutually separate pressure regions (32a-c) which are respectively connected to at least one of the fluid inlets (22a-c), so that the piston cutouts are respectively connected in a fluid-conducting manner to one of the pressure regions, characterized in that the multi-segment roller is configured to allow the position of the two or more sealing elements (30a-b) in the fluid-guiding cutout to be changed in a reversible and non-destructive manner in order to change the dimensions of the pressure regions (32a-c). a) a main body comprising: i) a fluid-guiding cutout, ii) five or more piston cutouts, which are respectively connected in a fluid-conducting manner to the fluid-guiding cutout, and iii) three or more fluid inlets (22a-c), which are respectively connected in a fluid-conducting manner to the fluid-guiding cutout, i) a fluid-guiding cutout, ii) five or more piston cutouts, which are respectively connected in a fluid-conducting manner to the fluid-guiding cutout, and iii) three or more fluid inlets (22a-c), which are respectively connected in a fluid-conducting manner to the fluid-guiding cutout, b) five or more pistons, which are respectively arranged in the piston cutouts in such a way that, as a result of a pressure increase in the fluid-guiding cutout, they are able to perform a stroke movement, and c) five or more carrier plates, which respectively have an inner clearance, wherein the main body extends through the inner clearances of the carrier plates in such a way that the carrier plates are respectively arranged at the height of at least one piston cutout, wherein the inner clearances are dimensioned such that the position of the carrier plates relative to the main body can be respectively changed by the stroke movement of at least one of the pistons, wherein the multi-segment roller comprises in the fluid-guiding cutout two or more sealing elements (30a, 30b) for fluid-tight sealing of the fluid-guiding cutout, by way of which sealing elements the fluid-guiding cutout is subdivided into three or more mutually separate pressure regions (32a-c) which are respectively connected to at least one of the fluid inlets (22a-c), so that the piston cutouts are respectively connected in a fluid-conducting manner to one of the pressure regions, characterized in that the multi-segment roller is configured to allow the position of the two or more sealing elements (30a-b) in the fluid-guiding cutout to be changed in a reversible and non-destructive manner in order to change the dimensions of the pressure regions (32a-c).