Motorcycle Engine Parts Piston Rings Kit Bore STD Size 66mm For TR250 250 This piston rings kit is designed for use with a 1 cylinder motorcycle engine, featuring a standard bore size of 66mm.Constructed from nodular cast iron, the rings offer performance and resistance to wear under operating temperatures.The set meets ISO9001 standards for consistent manufacturing quality and is suitable for applications requiring internal combustion engine components.The design supports effective compression sealing and oil control, contributing to stable engine.This kit includes all necessary ring components for complete piston assembly replacement. This component is produced by an independent manufacturer.Brand names are used for compatibility illustration.