METHOD FOR PRODUCING BASE TIRE AND METHOD FOR PRODUCING TIME

In the method for producing a tire casing of the present invention by vulcanizing a casing portion comprising a belt portion composed of multiple belt layers, a side portion and a bead portion and also comprising at least any one of a tread casing and a belt under-cushion rubber, a rubber composition containing carbon black having a nitrogen adsorption specific surface area of from 25 to 130 m/g as defined in JIS K 6217-2:2001 in an amount of from 25 to 45 parts by mass per 100 parts by mass of the rubber component therein is used as at least the rubber composition constituting the tread casing to be a part of the tread portion or the rubber composition constituting the belt under-cushion rubber, and accordingly, the rolling resistance of the tire can be reduced and the durability thereof can be improved.