Abstract: The invention provides a machine for automatically fitting tires to rims, comprising a continuously driven endless conveyor (1), a first feed device (3) provided at the entrance of the conveyor for placing rims (A) one after the other flat on the carrier side (4) thereof, a second feed device (5) situated downstream of the first one for placing a tire (B) of corresponding size aslant on each rim, a tire-fitting head (6) situated downstream of the second feed device for fitting the tire to the rims, and means (7) for discharging the tired rims.This machine is characterized in that it comprises adjustment means (16) disposed upstream of the tire-fitting head (6), for automatically and continuously bringing the upper face of rims (A) to a constant predetermined height with respect to the carrier side (4) of the conveyor (1).