MAHLE 51245.030 Standard Engine Piston Ring Set - 0.030 Over Bore

The MAHLE 51245.030 is a standard replacement engine piston ring set sized 0.030" over the stock bore diameter. Part of MAHLE's Original line — formerly marketed under the Perfect Circle brand — these cast iron rings are engineered to OE specifications for a precise, reliable fit during engine rebuilds and overhauls.

Key Features:

• Cast iron construction delivering high tensile strength, high yield strength, and excellent hardness
• Low ring mass for reduced stress and minimal groove pound-out over the life of the engine
• 0.030" oversize bore sizing for use with standard 0.030" overbore machined cylinders
• Pre-lapped finish allows rings to seat immediately, virtually eliminating extended break-in time
• Full 3-ring set including top compression ring, intermediate/second ring, and oil control ring assembly
• Optimized ring tension for reduced friction, improved cylinder conformability, and extended service life
• Excellent blow-by control with low friction for improved oil economy and compression retention

MAHLE is the world's largest manufacturer of piston rings, with deep OE engineering expertise applied directly to their aftermarket product line. The MAHLE Original 51245.030 ring set is a trusted choice for professional engine builders and technicians performing engine overhauls requiring a 0.030" overbore.