Zinc plated, wind up adjustable height jockey wheel. Self locking swing-away mount bracket. Pneumatic tyre is 250mm (10″) in diameter with a standard car valve for inflation and is fitted to a two piece metal rim. BLA CodeOverall Length Retracted mmOverall Length Extended mmPost Dia. mmMount Type 21518770095048Swivelling Accessories 215176 Spare wheel complete with tyre and tube