N20B20A 2.0T Pistons Rings Φ84mm CR 10:1 11257640166 11257594453 11257618811 WG1175839 For 328i 428i 528i X3 F30 F10 Pistons and rings designed for engines with model numbers N20B20A, N26B20A, and N20B20B.Features a compression ratio of 10:1 and cylinder bore diameter of Φ84mm.Pin diameter measures Φ22mm with ring thicknesses of 1.2mm, 1.5mm, and 2.0mm.Compatible with a range of models including 328i, 428i, 528i, X3, F30, F10, and F25.Designed as a direct replacement for components, supporting efficient combustion and consistent engine performance.Includes all necessary parts for installation. Disclaimer: This is a compatible replacement part.Any brand or model mentioned is for compatibility demonstration, not endorsement.