Arrangement for securing the beads of a pneumatic tire in the rim therefor

In combination with a wheel rim having seating surfaces for tire beads, and with a pneumatic vehicle tire with beads mounted on said rim:

• an annular inflatable body arranged within said tire and provided with reinforcing thread-shaped intercrossing members respectively ascending in left hand and right hand direction and respectively defining two superimposed layers embedded in said inflatable body, and arranged at least approximately symmetrically with regard to the circumferential direction of said tire, said inflatable body when in approximately non-inflated condition having an inner diameter which is greater than the diameter defined by the seating surfaces of said rim for the tire beads while said thread-shaped members of each of said superimposed layers in said approximately non-inflated condition define with the circumferential direction of said tire an angle of from 23.degree. to 32.degree. as to outer periphery entirely, said inflatable body when in inflated condition pressing the tire beads against the outer rim portions, the inflatable body at its outer diameter extending to the tire circumferential direction at such an angle that said outer diameter of said inflatable body will during the inflation of the latter practically be retained while its inner diameter will be reduced to such an extent that the inflatable body in inflated condition rests under pressure against said tire beads.