The present invention relates to an installation (10) for calibrating a measuring gauge for an external bearing (12) of a turbomachine, said bearing (12) comprising a rolling track, the radially inner, the installation including: - a supporting table (14) on which the bearing (12) carrying the gauge is fixed; - a ring (18) of the tread which is mounted coaxially to the bearing (12), which comprises a conical outer face (22) which is in abutment against the rolling path of the bearing (12) by means of a plurality of balls or rollers (20); - a shaft (36) for driving the ring (18) in rotation about the main axis (a) of the bearing (12), - of the means (24) of axial stress of the bearing (12), characterized in that it comprises a drum (42) of support on which the ring (18) is fixed in removable manner, which comprises means (38) for coupling with the shaft (36) for driving in rotation and the connection means (32, 50) with the means (24) of axial stress.
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