This piston and ring set includes six assemblies compatible with N55B30 and N55B30A 3.0L turbocharged engines.Standard dimensions: 84.00 mm cylinder bore, 22 mm wrist pin diameter, 54 mm wrist pin length.Ring thicknesses: 1.2 mm (), 1.5 mm (second), 2.0 mm (oil control).Compatible with various models from 2010–2017 including 135i, M135i, M235i, 335i, ActiveHybrid 3 Series, 335i Gran Turismo, 435i, 535i, 535i Gran Turismo, 640i, X3 xDrive35i, X4 xDrive35i, X5 xDrive35i/xDrive40i, and X6 xDrive35i.Fits chassis codes E82, E88, F20, F21, F22, F23, F87, E90, E91, E92, E93, F30, F31, F80, F34, F32, F33, F36, F82, F83, F10, F11, F07, F12, F13, F25, F26, F15, F85, E71, E72, F16, F86.