MAHLE CB-1286P-.25mm P-Series TriMetal Engine Connecting Rod Bearing Pair -0.25mm Undersize

The MAHLE CB-1286P-.25mm is a P-Series TriMetal connecting rod bearing pair engineered for engines requiring a -0.25mm undersize bearing, typically used when the crankshaft journal has been reground to restore proper tolerances. Sold as a pair, this bearing is designed as a direct replacement during engine rebuilds and overhauls.

MAHLE's P-Series TriMetal construction features a cast copper-lead alloy layer over a steel backing, providing approximately 20% greater fatigue strength compared to powdered metal (sintered) processes used in competing bearings. The electroplated overlay promotes conformability, embedability, and low-friction operation, making it a reliable choice for both stock rebuilds and more demanding applications.

Key Features:

• P-Series TriMetal design — cast copper-lead construction for superior fatigue strength
• -0.25mm undersize — engineered for use with reground crankshaft journals
• Higher load capacity compared to standard Bi-Metal engine bearings
• Excellent conformability and embedability for improved wear resistance
• Suitable for heavy-duty, street performance, and motorsports applications
• Meets or exceeds OEM specifications
• Sold as a pair (2 bearing shells)

The MAHLE CB-1286P-.25mm is an ideal solution for engine rebuilders seeking a proven, high-performance connecting rod bearing that delivers long-term durability and precise fitment in applications requiring an undersize bearing.