King Racing Main Bearings XP Tri-MetalKing Racing Main Bearings XP Tri Metal: Successful race engine builders are constantly pushing the limits of load capacity to new levels. Race bearings today inevitably need to match these demands with more competitive bearings. At King Racing we met the challenge with the XP high performance bearings series. The XP series is a line of bearings with advanced metallurgical and geometric technologies that meet extreme performance loads. It was developed