The locking ring for the rear axle mounting bolt of the Citroen 11CV/15CV is a crucial component that ensures the mounting bolt remains securely in place, preventing any unintended loosening. This part is vital for maintaining safety and stability while driving, especially in classic cars where precision and reliability are key. The ring is designed to fit perfectly on the rear axle mount, providing a secure grip without the need for additional adjustments. For those looking to keep their classic Citroen in top condition, this locking ring is essential for the proper functioning of the mounting system.