Abstract: In order to measure a two-wheeled vehicle frame, in which an essentially U-shaped measurement bracket (12) with two limbs (13) and an upper crossbar (14) is inserted, centered, into a retaining hole (5) which is at right angles to the longitudinal axis, and is moved to a fixed angular position, an optically acting component (9) is mounted in a defined position relative to the steering axis (2) of the two-wheeled vehicle frame, and a relative position between the measurement bracket (12) and the optical component (9) is fixed by means of a beam path between the measurement bracket (12) and the optically acting component (9), the invention provides that the optically acting component (9) is mounted in the headstock (1) without any play but such that it can rotate, using an adjustable-height insert (7) which in provided with a first scale, the crossbar (14) is provided with a horizontal marking (18) and with a central horizontal second scale (17), the crossbar is provided with an optically acting surface (16), w

Abstract: In order to measure a two-wheeled vehicle frame, in which an essentially U-shaped measurement bracket (12) with two limbs (13) and an upper crossbar (14) is inserted, centered, into a retaining hole (5) which is at right angles to the longitudinal axis, and is moved to a fixed angular position, an optically acting component (9) is mounted in a defined position relative to the steering axis (2) of the two-wheeled vehicle frame, and a relative position between the measurement bracket (12) and the optical component (9) is fixed by means of a beam path between the measurement bracket (12) and the optically acting component (9), the invention provides that the optically acting component (9) is mounted in the headstock (1) without any play but such that it can rotate, using an adjustable-height insert (7) which in provided with a first scale, the crossbar (14) is provided with a horizontal marking (18) and with a central horizontal second scale (17), the crossbar is provided with an optically acting surface (16), w

Abstract: The invention relates to a device and a process for measuring the position of a first axis in relation to a second axis, in particular for measuring a bicycle frame having a steering axis which, in the desired state, lies in a main plane of symmetry and has a second axis which, in the desired state, runs at right angles to the main plane of symmetry, for example a swinging arm axis or a bottom bracket axis of a bicycle frame. The device or process includes measuring bodies being fitted to the first axis to be measured and two image recording devices, in particular CCD cameras, which are spaced apart from each other in a fixed spatial relationship to the second axis and aligned with the measuring bodies. The evaluation is carried out by means of known methods of photogrammetry and a computing unit.