Abstract: This invention provides an envelope configuration for retreading tires using a cold-retreading process. Envelopes formed by two parts are known in the prior art. However, the known sealing means between parts are not satisfactory, either due to sealing problems or due to decreasing the envelope useful life. In order to overcome these limitations, this invention provides an envelope (20) comprised of two parts (22, 24), in which an end region (224a) of a flap (224) of the first part (22) is covered by an end region (244a) of a flap (244) of the second part (24), or vice-versa, in order to form an overlapping joint, in which a free end of the flap (224) of the first part (22) has at least one differentiated cross section (224b) whose thickness is greater than that of the flap (224) of the first part (22), and in which the overlapping joint is covered by an elastic ring (26) that is wide enough to cover said differentiated cross section (224b).

Abstract: A toroidal body support is provided for pneumatic coverings, having rims, side walls and flat zone as a base for tread. The body is finished, without tread and includes a peripheral flat zone covered by a removable woven yarn layer, with a width that is wider than that of the flat zone to form side edges to assist removal.

Abstract: A universal body-support for pneumatic tread is presented as a finished part for tailored application of any type of tread in which usual frame if formed by talons wings and flat area presenting bearing area and not having tread and tread having base layer coated by an elastomeric layer, compatible to the elastomeric layer, having self-adhesive characteristics and is protected against oxidation and contaminants by a film made of removable plastic material or by braided thread layer.