CYLINDER RINGS CATALOGUE Piston Rings Rider Rings Piston Rings 2101 (1 piece)Straight cut piston ring 2102 (1 piece)Angle cut piston ring 2103 (1 piece)Step cut piston ring 2104 (1 piece)Angle cut piston ring, pressure balanced 2120 (2 piece)Angle cut piston ring, pressure balanced 2121 (2 piece)Step cut piston ring Rider Rings 2201Rider Ring, solid, uncut 2202 (1 piece)Angle cut rider ring, shoulder relieved 2203 (1 piece)Angle cut rider ring, fully pressure relieved 2222 (2 piece)Angle cut rider ring, fully pressure relieved