MAHLE 4025MS-112 File Fit Piston Ring Set - 4.020in 005in 1.0/1.0/2.0mm

The MAHLE 4025MS-112 is a file fit piston ring set engineered for high-performance and racing engine builds requiring precise bore-to-ring end gap fitment. Designed for a 4.020-inch bore diameter with a +.005-inch oversize, these rings feature a 1.0mm / 1.0mm / 2.0mm groove width configuration (top compression / second compression / oil control), making them compatible with modern performance stroker and race engine applications.

MAHLE Motorsports file fit rings ship with intentionally tight end gaps, allowing engine builders to custom-fit each ring to their specific bore and application for optimized sealing and maximum power retention. This is the preferred method for serious performance builds where precise ring end gap control is critical.

Key Features:

• Bore Size: 4.020 inches (+.005 oversize)
• Ring Width Configuration: 1.0mm (top) / 1.0mm (second) / 2.0mm (oil)
• File Fit Design: Allows custom end gap sizing for your specific application
• Manufactured by MAHLE Motorsports — a globally recognized OEM and performance ring supplier
• Suitable for high-performance, forced induction, and racing engine builds
• Precision-ground for consistent quality and dimensional accuracy

MAHLE is a trusted OEM supplier and motorsports piston ring manufacturer with decades of experience in engine component engineering. The 4025MS-112 is part of their motorsports ring line, built to meet the demands of professional engine builders and serious performance enthusiasts.