PURPOSE: To provide a tire fitting method in which the tire uniformity can be improved by reducing RFV when a tubeless tire for passenger car is fifted on a rim by using an automatic air injector and the generation of flat spot can be prevented after being left for a long time.

CONSTITUTION: As for a method for fitting a tubeless tire for passenger car on a rim by pouring air into the tubeless tire from a gap between the bead sheet of the rim and the bead part of the tubeless tire, in the state where the tubeless tire is assembled oh the rim, the original pressure Pd of the poured air is set to 6.5-8.5Kh/cm2 in order to obtain the tire charged pressure affer fitting of 3.15kg/cm2 or more. RFV can be reducue by increasing the original pressure Pa, i.e., the charged pressure P.