Freewheel hub for a bicycle

A freewheel hub for a bicycle, comprising:

• a driver and a hub sleeve, which are each supported on a hub axle in such a way as to be rotatable about a common axis of rotation,
• a detent body arrangement comprising at least one detent body, which is supported in a radial detent body recess in such a way as to be displaceable between a locking position and a release position, and
• a preloading device, which is configured to preload the detent body towards the locking position,
• wherein the detent body recess is provided in a component comprising one of the driver or the hub sleeve, while the other component comprising the driver or the hub sleeve has a radial driving tooth system or is connected for conjoint rotation to the driving tooth system,
• wherein the surface of the detent body has a coupling surface, which rests against a contact surface of the detent body recess in the locking position, while an engagement portion of the detent body engages in the driving tooth system, such that, when the driver rotates in a first direction of rotation about the axis of rotation, torque is transmitted from the driver to the hub sleeve via the coupling surface, and wherein, in the release position, the detent body allows rotation of the hub sleeve relative to the driver in the first direction of rotation,
• wherein more than half of the coupling surface is designed as a planar region, and
• wherein the planar region of the coupling surface encloses an angle of no more than 30° with the normal from the centre of the planar region to the axis of rotation, and
• wherein the coupling surface is composed of the planar region and a curved region wherein the curved region serves for a rotatable support of the detent body as a detent pawl during its pivoting movement between the locking position and the release position.