The present specification relates to an adjustable seat for a wheelchair, the seat being adapted to be removably arranged in the wheelchair, the seat comprising a first rolling element, a carrying element, a supporting structure adapted to support the first rolling element and the carrying element, an endless belt, at least one of the first rolling element and the endless belt further comprising means for providing an engagement between the first pulley and the endless belt, and means for applying a rotational motion to the first rolling element. The first rolling element is arranged to be rotatably supported by the supporting structure, the endless belt is adapted to rotate about the first rolling element and the carrying element, wherein the first rolling element is a drive rolling element adapted to transfer a rotational motion induced by said means for applying a rotational motion to said at least one first rolling element to said endless belt. The present specification further relates to a wheelchair comprising such a seat.
