Inspection vehicle which is conceived to be inserted into the air gap between a rotor and a stator of an electric machine, in particular of a generator, and to be moved on the substantially cylindrical external circumference of the rotor so as to inspect the external circumference of the rotor and/or the internal circumference of the stator for damage, said inspection vehicle comprising - a housing which is configured so as to be in particular substantially rectangular and has a housing front side that points in the main direction of travel, an opposite housing rear side, housing longitudinal sides that are disposed so as to be mutually opposite and connect the housing front side and the housing rear side to one another, a housing lower side that in the inserted state of the inspection vehicle points toward the rotor, and an opposite housing upper side; - inspection technology which is at least largely received in the housing; and - at least four traction groups; wherein the traction groups are held in pairs so as to be opposite one another on the housing longitudinal sides, each traction group has at least two wheels which by separate motors are able to be driven to as to rotate about mutually parallel wheel axes that extend so as to be perpendicular to the main direction of travel; and each traction group is fastened to an intermediate element so as to be pivotable about a first pivot axis that extends so as to be parallel to the wheel axes, said intermediate element in turn being fastened to the housing so as to be pivotable about a second pivot axis that extends so as to be parallel to the first pivot axis, and so as to be pivotable up and down about a third pivot axis that extends so as to be perpendicular to the second pivot axis, wherein the pivoting movement of one traction group about the third pivot axis thereof is coupled to the pivoting movement of the opposite traction group about the third pivot axis thereof. which is conceived to be inserted into the air gap between a rotor and a stator of an electric machine, in particular of a generator, and to be moved on the substantially cylindrical external circumference of the rotor so as to inspect the external circumference of the rotor and/or the internal circumference of the stator for damage, said inspection vehicle comprising - a housing which is configured so as to be in particular substantially rectangular and has a housing front side that points in the main direction of travel, an opposite housing rear side, housing longitudinal sides that are disposed so as to be mutually opposite and connect the housing front side and the housing rear side to one another, a housing lower side that in the inserted state of the inspection vehicle points toward the rotor, and an opposite housing upper side; - inspection technology which is at least largely received in the housing; and - at least four traction groups; - a housing which is configured so as to be in particular substantially rectangular and has a housing front side that points in the main direction of travel, an opposite housing rear side, housing longitudinal sides that are disposed so as to be mutually opposite and connect the housing front side and the housing rear side to one another, a housing lower side that in the inserted state of the inspection vehicle points toward the rotor, and an opposite housing upper side; - inspection technology which is at least largely received in the housing; and - at least four traction groups; wherein the traction groups are held in pairs so as to be opposite one another on the housing longitudinal sides, each traction group has at least two wheels which by separate motors are able to be driven to as to rotate about mutually parallel wheel axes that extend so as to be perpendicular to the main direction of travel; and each traction group is fastened to an intermediate element so as to be pivotable about a first pivot axis that extends so as to be parallel to the wheel axes, said intermediate element in turn being fastened to the housing so as to be pivotable about a second pivot axis that extends so as to be parallel to the first pivot axis, and so as to be pivotable up and down about a third pivot axis that extends so as to be perpendicular to the second pivot axis, wherein the pivoting movement of one traction group about the third pivot axis thereof is coupled to the pivoting movement of the opposite traction group about the third pivot axis thereof.