Supertech 89.5mm Bore Piston Rings - 1x3.30 / 1.2x3.70 / 2.8x3.30mm High Performance Gas Nitrided

These Supertech piston rings are gas nitrided, a surface hardening process that makes the ring material tougher and more resistant to wear. This specific set is designed for an 89.5mm bore and features a unique ring groove sizing: 1x3.30mm for the top ring, 1.2x3.70mm for the second ring, and 2.8x3.30mm for the oil ring. This precise sizing is crucial for achieving a good seal between the piston and cylinder wall, which directly impacts engine compression and oil control.

The nitriding process not only improves durability but also helps the rings maintain their shape under high temperatures and pressures, contributing to consistent engine performance over time. When rebuilding an engine, selecting the correct piston ring dimensions and material is essential for proper break-in and long-term reliability. These rings are a solid option for builds where a precise fit and robust surface treatment are desired.