A two-wheeler lock, in particular a frame lock, wherein the lock is preferably at least partly drivable in a motorized manner, comprises a sensor for detecting different positions of an element of the lock movable along a defined movement path. The movable element here has a permanent magnet and the sensor is configured as a magnetic sensor. This magnetic sensor is furthermore configured for a three-dimensional magnetic detection to detect positions or movements of the movable element deviating from the defined movement path and/or to detect manipulation attempts by means of external magnets.