In the case of a round spring 12 is again a, in particular em - tires, with a to the supporting carcass (2) applied new tread strip (3) can be achieved by a long service life of the tread strip (3) can be achieved in that the latter is, as at only one point of an open torus with in the circumferential direction and the axial direction of curved, to the outer contour of the carcass (2) of an adapted inner contour is produced and by means of a thin rubber binding layer (4) to the circumferential surface of the carcass (2) is vulcanized in the area of the lateral shoulders shoulder structure is freely.
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