A variably positionable bicycle wheel anchor for fixing a bicycle wheel at a desired location along an elongate support rail. The bicycle wheel anchor includes a body configured to be slidingly coupled to an elongate support rail for variable, fixed positioning of the body along a length of the elongate support rail. The underside of the body has a support rail engagement surface and the upper side of the body has a bicycle wheel receiver. The wheel anchor has a deployable interference mechanism coupled to the body and having a deployed configuration in which at least a portion of the interference mechanism protrudes beyond the underside of the body for releasable engagement with the elongate support rail.