Patent ID: 6453961
Filing Date: 2002-09-24
Classification: B60C

Abstract:
A pneumatic radial ply runflat tire having a tread, a carcass comprising at least one radial ply and two bead regions and two sidewalls each reinforced by at least one insert, a belt structure between the tread and the carcass, the tire characterized by:each insert having an elastomeric porous section located at the axially-inner portion of the insert, the elastomeric porous section being embedded into an elastomeric stiffer layer which constitutes the remainder of the insert; the porous section having a crescent shaped cross-section; the elastomeric porous section being a closed cell porous elastomer or thermoplastic elastomer; and the porosity of the porous sections is between 10 and 40 percent elastomer and the remainder gas.