The present invention relates to a runflat device arranged to be disposed within a wheel well of a wheel having a rim (5) for securing a tire (1), the device comprising a valve assembly (7, 8, 9, 10) arranged to be secured to the wheel and a plurality of part-annular components, said runflat device arranged to be drawn onto the wheel by a retraction mechanism when air pressure is applied to said valve (7, 8, 9, 10).