Abstract: A process and a rubber-base bonding material in the form of a preformed strip for retreading vehicle tires using a prevulcanized tread and microwave heating for vulcanizing and binding the bonding strip to the tire carcass and to the tread is disclosed, wherein a bonding strip is used whose dielectric loss factor at the vulcanizing (retreading) temperature is higher than the loss factor of the prevulcanized tread, so that the microwave heat applied will be concentrated to the bonding strip and vulcanize the same providing satisfactory adhesion between carcass and tread without the already prevulcanized tread being destroyed or significantly reduced in quality due to the effect of the excess heat.