A method for locking a tyre to a wheel rim, includes the steps of mounting a tubular tyre locking element on the wheel rim, which tubular locking member is arranged with a valve, which valve is pushed through a hole in the rim; mounting a tyre on the rim such that the tyre encloses the tubular tyre locking element and a pressure chamber is obtained between the tyre locking element and the tyre; pressurizing the tubular tyre locking element via the valve such that it expands, whereby the beads of the tyre are pressed against the flanges of the wheel rim; inserting a hollow needle through the tyre and into the pressure chamber, which hollow needle is connected to a pressurized air source; pressurising the pressure chamber to desired pressure, removing the hollow needle; and sealing the hole caused by the needle with sealing fluid or plug.