Replacement Piston Ring Set. Wiseco piston ring sets are made specifically to Wiseco’s specifications to provide ultimate performance and sealing with Wiseco’s pistons. Ring designs and materials are tested and validated for durability and performance. Wiseco replacement ring set. Durability, longevity and increased horsepower. Maintain their size and geometry for exceptional ring seal providing sustained peak performance in race applications. Each ring set is for one piston. Notes: Wiseco rings ONLY fit Wiseco pistons. Image is for display only, actual item may vary by fitment. Detailed Specifications: Bore - actual: 66.40 mm.