Genuine OEM Audi Crankshaft Poly V-Belt Pulley, part number 03F105255A. This pulley is mounted on the crankshaft and is responsible for driving various accessory components via a V-belt. It ensures the efficient transfer of power to systems like the alternator, power steering pump, and air conditioning compressor. Weighing 0.505 kg, this component is engineered for high rotational speeds and long service life. Choosing a genuine OEM pulley ensures correct dimensions, material strength, and balance for vibration-free operation and reliable accessory drive.