A wheel unit of a vehicle having a rim on which a tire is mounted, and having a hub which can rotate about an axis of rotation (T), wherein the hub includes a hub body in which a control element that is mounted such that it is displaceable relative to the hub body in the direction of the axis of rotation (T) between a first position and a second position is accommodated. A fluid channel which fluidically connects the tire to a first space formed between the control element and the hub body is configured in the rim. In the first position of the control element, a fluidic connection between the first space and a second space formed between the control element and the rim is interrupted, whereas, in the second position of the control element, a fluidic connection between the first space and the second space is established.

Rotor with breather and anti-rotation arrangement for tire calibration arrangements that provides a suitable breather of the axle hub, and, in turn, an improved oil retention thus preventing the premature wear of internal pieces and possible accidents during its operation.