Wheel hub adaptor (11) attachable to vehicle wheel to attach vehicle accessory for rotation with vehicle wheel, has an inner mounting plate (15) with recesses or apertures (17) to match a vehicle wheel stud pattern, a body (19) extending from the plate (15) to an outer mounting plate (27) having a mount to which the vehicle accessory attaches. The mount has apertures (65) which align with studs (75) on a mating mount of the vehicle accessory. The inner mounting plate and the outer mounting plate mount to the vehicle wheel and vehicle accessory respectively, by rotating apertures (17 65) to stop portions (35 71), and is secured by a bolt passing through one of two circular apertures (43 45) or (67 69). Vehicle accessories can be provided like a paddle to self-propel the vehicle in sand, and a wheel to widen the vehicle track.