What does STDX sizing mean for these bearings?

STDX sizing indicates that these main bearings are 0.001 inch undersize compared to a standard size. This is often used when the engine's crankshaft journals have been machined down slightly or when a tighter oil clearance is desired.

What is the advantage of the STDX overlay design?

The STDX overlay is a specialized material applied to the bearing surface. It's designed to offer improved performance and durability, helping to withstand the stresses and heat generated during engine operation.

What is the typical application for this main bearing set?

This main bearing set is designed for BMW engines, specifically the N55 B30A, N53 B30A, and N52 B30A models. It's commonly used during engine rebuilds or repairs where main bearings need replacement to ensure proper crankshaft support and oil clearance.

King Engine Bearings Main Bearing Set STDX MB7776GPCSTDX

Name: King Engine Bearings BMW N55 B30A/ N53 B30A/ N52 B30A Main Bearing Set - Size STDX
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-n55-b30a-n53-b30a-n52-b30a-main-be-t14-432600
Price: 273.86 USD
Availability: InStock

King Engine Bearings BMW N55 B30A/ N53 B30A/ N52 B30A Main Bearing Set - Size STDX

$273.86

Only 5 left in stock

King Engine Bearings main bearing set for BMW N55, N53, and N52 B30A engines. Size STDX.

Key Features

Fits BMW N55 B30A, N53 B30A, and N52 B30A engines.
Main bearing set with STDX sizing (0.001 inch undersize).
Features King's unique STDX overlay for improved performance.
Well-built with a multi-layer metal system for durability.
Supports crankshaft and maintains proper oil clearance.

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Product Details

The STDX bearing design from King Engine Bearings features a unique overlay structure that offers improved performance and durability for your BMW N55, N53, or N52 B30A engine. This main bearing set is specifically sized as STDX, which is a 0.001 inch undersize, ensuring a precise fit for engines that may have undergone minor machining or require a slightly tighter clearance. These bearings are built with a multi-layer metal system, combining a steel backing for strength with a specialized overlay that handles the demands of modern engine operation.

When rebuilding or refreshing your BMW's engine, the main bearings play a critical role in supporting the crankshaft and maintaining proper oil clearance. King Engine Bearings is known for well-built components, and this set is no exception. The STDX sizing is a notable detail for mechanics looking for a specific fitment option, often used when a standard size might be too loose after honing or other machine work. Choosing the right bearings ensures the crankshaft spins smoothly, reducing friction and wear for a longer-lasting engine.