MAHLE 4265MS-112 File Fit Piston Ring Set - 4.265in 1.0mm 1.0mm 2.0mm

The MAHLE 4265MS-112 is a File Fit Piston Ring Set designed for high-performance and motorsport engine builds. Featuring a 4.265-inch bore diameter with a +.005-inch oversize, this ring set uses a modern 1.0mm / 1.0mm / 2.0mm ring pack configuration—ideal for race engines and performance applications where reduced friction and improved sealing are critical.

File fit rings allow the builder to precisely set the end gap to exact specifications for their application, ensuring optimal compression sealing and long-term durability under high cylinder pressures and temperatures.

Key Features:

• Bore Size: 4.265 inches (+.005in oversize)
• Ring Pack: 1.0mm top compression ring / 1.0mm second compression ring / 2.0mm oil control ring
• File Fit Design: Allows precise custom end-gap setting for your specific build
• Motorsport-Grade Construction: Engineered to withstand high cylinder pressures and extreme operating temperatures
• Low-Tension Profile: Thin ring pack reduces friction for improved power output and efficiency
• MAHLE Motorsport Quality: Manufactured to OEM-level tolerances for professional engine builders
• Sold as a set for one engine (add -1 suffix to order a single-cylinder set)

MAHLE Motorsport piston rings are trusted by professional engine builders across drag racing, road racing, and performance street applications. The 4265MS-112 is part of MAHLE's comprehensive Motorsport ring line, offering a full range of bore sizes and ring pack configurations to suit virtually any high-performance build.