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 N20B20A, N26B20A, and N20B20B configurations.These components are engineered to fit models including 328i, 428i, 528i, X3, F30, F10, and related platforms.The set features a cylinder bore of Φ84mm, pin diameter of Φ22mm, and ring thicknesses of 1.2mm, 1.5mm, and 2.0mm.With a compression ratio of 10:1, the design supports efficient combustion and consistent engine performance.Components are built for direct replacement and intended to integrate into the specified engine types.