The John Deere R55872 is a genuine OEM idler pulley designed for a wide range of John Deere agricultural equipment, including tractors, combines, sprayers, and cotton pickers. This essential component ensures proper belt tension and smooth operation of drive systems, reducing wear and tear on other parts. Manufactured to John Deere's rigorous standards, it provides reliable performance and a precise fit. Key dimensions include an outer diameter of 152.4 mm, an inner diameter (bore) of 17.46 mm, and a width of 31.75 mm.