Mahle MS 4.165in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

Mahle is a well-known name in engine components, especially for their piston rings. This specific set, the 4170MS-112, is a file-fit ring set designed for engine rebuilding projects where precise ring gap adjustment is needed. The file-fit design means you'll adjust the end gap yourself to match your specific cylinder bore, ensuring a solid seal and optimal performance for your engine.

This set features a 1.0mm top ring, a 1.0mm second ring, and a 2.0mm oil control ring. They are manufactured to a +.005 inch undersize, which is important to note for your build. The standard tension is suitable for a wide range of applications. Because these are file-fit, they offer a lot of flexibility for builders who want to dial in their engine's compression and oil control.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for proper installation procedures and ring gap specifications.