The Washer(526) is the lowest priced item on this Rear Wheel schematic.
Some items from this specific schematic: Lever, Camshaft, Nut, Self Locking (3l6), Nut, Self-locking (3y2), Rim Assy.
With a quantity of four pieces, the Bolt, Washer Based(45l) is the most used part in the REAR WHEEL diagram.