In the case of a tensioning - device for bracing the in the region of a running surface (19) remote side surfaces (18, 18 ') arranged beads of a filled with compressed gas (15) tire (2) with the two opposing horns (4, 4') of the tire (2) supporting felgens (10), an undesired escape of compressed gas (15) by the usually are always present, free spaces between a tire bead and the adjacent rim flange prevented by the fact that a between the with a respective tire bead (120, 120 ') coated rim flanges (4, 4') loosely mounted clamping body (1) is provided, the concavely curved side surfaces (110, 110 ') to the convex curvature of the inner surface of the two opposing tyre beads are adapted to support said tyre beads in a gas-tight manner against the likewise formed in a convex curve of the rim flanges (4, 4') to press.n="34"
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