Abstract: Bearing equipped mounting members for mounting a rotor within a rotor chamber of a rotary fluid pressure displacement device. The rotor chamber has axially spaced end walls, and a peripheral wall including a pair of diametrically opposed arcuate walls and a pair of circumferentially spaced radially inwardly opening recesses intermediate the arcuate walls. The rotor has a cylindrical surface of a diameter less than the diameter of the arcuate walls to provide greater than normal running clearance therebetween, and the mounting members are disposed within the recesses for running engagement with the rotor.