What is the size of these main bearings?

These King Engine Bearings main bearings are sized at +0.75mm. This means they are intended for use with a crankshaft that has been machined down by 0.75mm to ensure proper clearance and oil film.

What material are these bearings made from?

The bearings are made from a bi-metal aluminum composite material. This construction is chosen for its balance of strength and compliance, suitable for the demands of engine operation.

Are these bearings suitable for high-performance or racing engines?

These bearings are described as ideal for medium-load engines. For extreme high-performance or racing applications, it's always best to consult with a specialist to ensure the chosen bearings meet the specific demands of your build.

Specifications

Brand: King Engine Bearings
Part #: MB7776SI0.75
UPC: 611500590375

King Engine Bearings BMW N55B30A/N53B30A/N52B30A Main Bearing Set - Size +0.75mm

Name: King Engine Bearings BMW N55B30A/N53B30A/N52B30A Main Bearing Set - Size +0.75mm
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-n55b30a-n53b30a-n52b30a-main-beari-t14-45777
Price: 85.16 USD
Availability: BackOrder

$85.16

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King Engine Bearings BMW N55/N53/N52 main bearing set. Size +0.75mm. Ideal for medium-load engines.

Key Features

This product is a main bearing set for BMW N55B30A, N53B30A, and N52B30A engines.
The bearings are sized at +0.75mm, intended for use with a machined crankshaft.
Constructed with a bi-metal aluminum material for reliable performance.
Features a lead-free composite material, making it an environmentally safe option.
Designed to be ideal for medium-load engines.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

When you're rebuilding the bottom end of your BMW with an N55B30A, N53B30A, or N52B30A engine, you'll get a set of King Engine Bearings main bearings in this package. These bearings are built with a lead-free composite material, making them an environmentally safe option. They are specifically designed for medium-load engines, offering a solid choice for many BMW applications.

King Engine Bearings has been specializing in engine bearings since 1960, focusing on supplying well-built components. This particular set is sized at +0.75mm, which is important to note if you are machining your crankshaft to match. The bi-metal aluminum construction is a common and reliable material for main bearings, balancing strength with the necessary compliance to handle the stresses within the engine.