This piston ring set is designed for Citroën ID/DS models with a single cylinder and an 86 mm diameter. These piston rings are crucial for maintaining a proper seal within the cylinders, ensuring optimal compression ratios. Suitable for both Citroën ID and Citroën DS, they offer reliable performance and durability. It is important to replace worn piston rings in a timely manner to maintain engine performance and efficiency. This set is ideal for classic car enthusiasts who wish to keep their Citroën ID/DS series in perfect working condition.