A device for marking tyres by means of laser beams, said tyres having a tread, a first, in a reclined position, upper sidewall comprising a first bead, a second, in a reclined position, lower sidewall comprising a second bead, and a rolling axle; and the device comprising: a laser device (100, 110) for marking the tyre by means of laser beams; and a holding device for receiving and holding the tyre to be marked on the first bead and/or on the second bead; characterised by a measuring device for detecting at least one of the sidewalls (41, 43) of the tyre; wherein the holding device is designed to be inserted from above into the interior of the tyre in a direction substantially parallel to the rolling axis and to be lifted after gripping the tyre at the first bead and/or at the second bead such that that the first sidewall and the second sidewall of the tyre are held freely suspended in space by the holding device and the outer sides of the sidewalls (41, 43) are thus freely accessible for marking by the laser device; wherein the holding device is configured to rotate the raised tyre, and wherein the holding device is further configured to simultaneously centre the tyre when gripped. said tyres having a tread, a first, in a reclined position, upper sidewall comprising a first bead, a second, in a reclined position, lower sidewall comprising a second bead, and a rolling axle; and the device comprising: a laser device (100, 110) for marking the tyre by means of laser beams; and a holding device for receiving and holding the tyre to be marked on the first bead and/or on the second bead; characterised by a measuring device for detecting at least one of the sidewalls (41, 43) of the tyre; wherein the holding device is designed to be inserted from above into the interior of the tyre in a direction substantially parallel to the rolling axis and to be lifted after gripping the tyre at the first bead and/or at the second bead such that that the first sidewall and the second sidewall of the tyre are held freely suspended in space by the holding device and the outer sides of the sidewalls (41, 43) are thus freely accessible for marking by the laser device; wherein the holding device is configured to rotate the raised tyre, and wherein the holding device is further configured to simultaneously centre the tyre when gripped. a laser device (100, 110) for marking the tyre by means of laser beams; and a holding device for receiving and holding the tyre to be marked on the first bead and/or on the second bead; characterised by a measuring device for detecting at least one of the sidewalls (41, 43) of the tyre; wherein the holding device is designed to be inserted from above into the interior of the tyre in a direction substantially parallel to the rolling axis and to be lifted after gripping the tyre at the first bead and/or at the second bead such that that the first sidewall and the second sidewall of the tyre are held freely suspended in space by the holding device and the outer sides of the sidewalls (41, 43) are thus freely accessible for marking by the laser device; wherein the holding device is configured to rotate the raised tyre, and wherein the holding device is further configured to simultaneously centre the tyre when gripped.