What does the +0.50mm sizing mean for these bearings?

The +0.50mm sizing indicates that these bearings are intended for use when the crankshaft journals have been machined down by 0.50mm during an engine rebuild. This allows for a proper fit and oil clearance with the reduced journal diameter.

What is the material of these King Engine Bearings?

These bearings are made from a bi-metal aluminum material. This composite is lead-free and considered environmentally safe, and it's well-suited for medium-load engine applications.

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

These bearings are designed for medium-load engines. For high-performance or racing applications, it's recommended to consult King Engine Bearings' specialized racing bearing lines to ensure they meet the demands of your specific build.

Specifications

Brand: King Engine Bearings
Part #: MB7776SI0.5
UPC: 611500587283

King Engine Bearings BMW N55B30A/N53B30A/N52B30A Main Bearing Set - Size +0.50mm

Name: King Engine Bearings BMW N55B30A/N53B30A/N52B30A Main Bearing Set - Size +0.50mm
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-n55b30a-n53b30a-n52b30a-main-beari-t14-45776
Price: 85.16 USD
Availability: InStock

$85.16

Only 7 left in stock

King Engine Bearings BMW N55B30A/N53B30A/N52B30A Main Bearing Set - Size +0.50mm. Well-built bi-metal aluminum bearings for medium-load engines.

Key Features

Fits many BMW models including 1 Series M, 3 Series, 5 Series, X3, X5, and Z4.
Main bearing set sized at +0.50mm for use with machined crankshaft journals.
Constructed from a bi-metal aluminum material.
Lead-free composite is environmentally safe.
Designed 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

If you're rebuilding the engine in your BMW, these King Engine Bearings main bearing set are a solid option. They are specifically made for BMW engines like the N55B30A, N53B30A, and N52B30A, and this set is sized at +0.50mm, meaning it's intended for use when the crankshaft journals have been machined down by 0.50mm. King has been specializing in bearings since 1960, focusing on making them the best available.

These bearings use a bi-metal aluminum material that's lead-free and environmentally safe. This composite is ideal for medium-load engines, offering a good balance of strength and wear resistance for many BMW applications. They fit right into a wide range of BMW models, from the 1 Series M to the X5 and Z4, making them a versatile choice for many rebuilds.