Folding support wheel for trailers and agricultural machines the jockey wheel has an attachment that can be folded automatically or manually if needed the adjustment is made by a lead screw nut the tube has a grease nipple at the top of the crank order the right grease for the grease nipple see accessories ideal for transports and horse trailers technical specifications max total length 900 mm solid rubber wheel 200 mm diameter folding stroke 235 mm tube length 470 mm tube diameter