6 Set Pistons Rings Kit STD 84mm For 2010-2017 F20 F21 F30 F10 X3 X4 X5 X6 N55B30 N55B30A Engine 11257589824 11257587914 Piston rings kit designed for engines with standard specifications. Cylinder bore size is 84.00mm. Wrist pin diameter is 22mm with a length of 54mm. Ring thicknesses are 1.2mm for the first ring, 1.5mm for the second ring, and 2.0mm for the third ring. Compatible with N55B30 and N55B30A 3.0L L6 engines displacing 2979cc and equipped with twin turbochargers. Matches OEM part numbers 11258619196, 11257610297, 11257610298, 11257589824, and 11257587914. Fits models including 135i, M135i, M135i xDrive, M235i, M235i xDrive, 335i, 335i xDrive, ActiveHybrid 3, 335i Gran Turismo, 435i, 435i xDrive, 535i, 535i Gran Turismo, 640i, X3 xDrive35i, X4 xDrive35i, X5 xDrive35i, and X6 xDrive35i or xDrive40i across various chassis codes such as 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, and F86 produced between 2010 and 2017. Disclaimer: This part is produced by a third-party manufacturer. Brand/model mentions are for compatibility illustration only.