Piston Ring 4.035 (1pk) 1.0mm 1.0mm 2.0mm

The Piston Ring 4.035 (1pk) 1.0mm 1.0mm 2.0mm is a precision-engineered piston ring designed for high-performance engine rebuilds and racing applications. This file-fit piston ring features a 4.035-inch bore diameter and standard tension construction, making it suitable for single-cylinder engine configurations requiring exact ring geometry and controlled compression.

The ring's construction combines steel with ceramic and metallic coating technology, delivering superior wear resistance and heat dissipation in demanding engine environments. The three-piece ring set configuration—with 1.0mm, 1.0mm, and 2.0mm thicknesses—provides optimized ring dynamics for compression, oil control, and blow-by management. File-fit design requires hand-fitting to achieve proper end-gap clearance, allowing builders to dial in exact tolerances for their specific bore and application. This level of precision control is critical for maintaining ring seal integrity and extending engine life under high-load conditions.

Performance engine builders, automotive machine shops, and motorsports enthusiasts rely on file-fit piston rings when rebuilding high-revving or forced-induction single-cylinder engines. Whether rebuilding a motorcycle, ATV, or small-displacement racing engine, this ring set accommodates the precision fitment and reliability demanded by competitive and street applications. The ceramic and metallic facing resists scuffing and corrosion, essential for engines running synthetic oils or aggressive fuel additives. Single-ring packs reduce inventory complexity while delivering the exact bore-specific solution your rebuild requires.