since the ribs of the wedge ribbed belt are disposed on its side remote from the cage support rollers 4 2 in order to nevertheless ensure lateral guidance of the wedge ribbed belt there are mounted at the cage floor 6 two guide rollers 4 4 provided with grooves which co operate with the ribs of the wedge ribbed belt 12 as lateral guidance fig2 shows a section of a wedge ribbed belt 12 1 which serves as support means of an elevator installation according to the invention the belt body 15 1 the wedge shaped ribs 20 1 and the tensile carriers 22 embedded in the belt body can be recognised fig3 shows a cross section through a wedge ribbed belt 12 1 according to the present invention which comprises a belt body 15 1 and several tensile carriers 22 embedded therein the belt body 15 1 is produced from a resilient material natural rubber or a number of synthetic elastomers are for example usable the flat side 17 of the belt body 15 1 can be provided with an additional cover layer or a fabric layer which is worked in the traction side which co operates at least with the drive pulley 4 1 of the drive unit 2 of the belt body 15 1 has several wedge shaped ribs 20 1 which extend in the longitudinal direction of the wedge ribbed belt 12 1 a belt pulley 4 in the periphery of which grooves complementary to the ribs 20 1 of the wedge ribbed belt 12 1 are formed is indicated.