The Vemo ABS Reluctor Ring (part number V10921486) is a crucial component of a vehicle's anti-lock braking system (ABS). It is a circular metal ring with teeth or notches that is mounted on the wheel hub. The ring rotates along with the wheel and is used by the ABS sensor to measure the speed and rotation of the wheel. This information is then used to determine when the wheel is about to lock up, allowing the ABS system to intervene and prevent the wheel from skidding. The Vemo ABS Reluctor Ring is a high-quality, durable and reliable component that is essential for the proper functioning of the ABS system.