What does '0.5mm undersize' mean for these bearings?

This means the bearings are manufactured to be slightly smaller than standard size. They are intended for use when the crankshaft journals have been machined down by 0.5mm to correct wear or prepare for new bearings.

What is the pMax Black material?

pMax Black is King Engine Bearings' tri-metal racing material. It's designed to handle higher loads and temperatures often found in performance and racing applications, offering improved strength and durability.

Do these bearings come with new main bolts?

This product is a main bearing set only. It does not include main bolts or any other installation hardware. It is recommended to consult the manufacturer's installation guide for a complete list of required components.

Specifications

Brand: King Engine Bearings
Part #: MB7039XP0.5
UPC: 611500542787

King Engine Bearings BMW M20/M50 2.0L/2.5L/2.7L (Size 0.5) Performance Main Bearing Set

Name: King Engine Bearings BMW M20/M50 2.0L/2.5L/2.7L (Size 0.5) Performance Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-m20-m50-2-0l-2-5l-2-7l-size-0-5-pe-t14-4339654
Price: 148.93 USD
Availability: BackOrder

$148.93

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King Engine Bearings performance main bearing set for BMW M20/M50 2.0L-2.7L engines. Features pMax Black racing material and a 0.5mm undersize. Fits a wide range of BMW models.

Key Features

Fits BMW M20, M50 2.0L, 2.5L, and 2.7L engines.
Features King's pMax Black racing material for improved load and temperature handling.
This is a 0.5mm undersize bearing set, intended for use with a machined crankshaft.
Tri-metal construction offers enhanced strength and durability for performance builds.
Designed for engines used in a wide range of BMW vehicles.

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About this part

Product Details

If you're rebuilding the bottom end of your BMW M20 or M50 engine, getting the main bearings right is crucial for long-term health and performance. This main bearing set from King Engine Bearings is built with their pMax Black material, which is a popular choice for racing applications because it handles higher loads and temperatures well. These bearings are also 0.5mm undersize, meaning they're designed to be used when the crankshaft journals have been machined down by 0.5mm to clean them up or correct wear.

King Engine Bearings is known for making well-built components, and this set is no exception. The pMax Black material is a tri-metal construction that offers improved strength and durability compared to standard bearings, making it a solid option for performance builds. Because these are an undersize bearing, it's important to ensure your crankshaft has been properly measured and machined to the correct 0.5mm undersize specification before installation.

This set fits a wide variety of BMW models from the late 1980s through the early 2000s, including popular cars like the E30 325i, E36 325is, and E39 525i. Make sure to confirm fitment for your specific vehicle year and model.