A mechanical runout measurement system comprising: a rotatable mount for a work piece, wherein the mount is configured to rotate the work piece; a displacement sensor proximate to a surface of the work piece, at a known position relative to the mount, and configured to measure a radial dimension of the work piece; a removable angle indicator attachable to the work piece and alignable such that the angle indicator is sensed by the displacement sensor during rotation of the work piece, and a computer system including a non-transitory memory which stores instructions that, when performed, cause the computer to: collect radial displacement data from the displacement sensor adjacent to the mount, wherein the radial displacement data indicates a radial dimension of a surface of the work piece; continue the collection of the radial displacement data as the work piece rotates about the mount; detect a portion of the radial displacement data representing the angle indicator in the collected radial displacement data; set an angular starting point at said portion; correlate each point of the radial displacement data with an angular location relative to and based on the angular starting point to determine a rotational position for the collected radial displacement data of the work piece relative to the angle indicator. a rotatable mount for a work piece, wherein the mount is configured to rotate the work piece; a displacement sensor proximate to a surface of the work piece, at a known position relative to the mount, and configured to measure a radial dimension of the work piece; a removable angle indicator attachable to the work piece and alignable such that the angle indicator is sensed by the displacement sensor during rotation of the work piece, and a computer system including a non-transitory memory which stores instructions that, when performed, cause the computer to: collect radial displacement data from the displacement sensor adjacent to the mount, wherein the radial displacement data indicates a radial dimension of a surface of the work piece; continue the collection of the radial displacement data as the work piece rotates about the mount; detect a portion of the radial displacement data representing the angle indicator in the collected radial displacement data; set an angular starting point at said portion; correlate each point of the radial displacement data with an angular location relative to and based on the angular starting point to determine a rotational position for the collected radial displacement data of the work piece relative to the angle indicator. collect radial displacement data from the displacement sensor adjacent to the mount, wherein the radial displacement data indicates a radial dimension of a surface of the work piece; continue the collection of the radial displacement data as the work piece rotates about the mount; detect a portion of the radial displacement data representing the angle indicator in the collected radial displacement data; set an angular starting point at said portion; correlate each point of the radial displacement data with an angular location relative to and based on the angular starting point to determine a rotational position for the collected radial displacement data of the work piece relative to the angle indicator.