What does the 0.25 size designation mean for these bearings?

The 0.25 designation indicates that these bearings are 0.25mm undersize. This means they are intended for use when the engine's crankshaft has been machined down by 0.25mm to ensure a proper fit and clearance during an engine rebuild.

What type of engine load are these bearings best suited for?

These bearings are designed with a lead-free composite and are ideal for engines that experience low to medium loads. They are a good choice for standard rebuilds where extreme performance demands are not the primary concern.

Are these bearings environmentally friendly?

Yes, these bearings feature a lead-free composite material. This makes them an environmentally safer option compared to bearings that contain lead, aligning with environmental regulations.

King Engine Bearings BMW M20B20-23-25-27 / M50B25 / M52B20-25-28 (Size 0.25) Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB798AM0.25
UPC: 611500183713

King Engine Bearings BMW M20B20-23-25-27 / M50B25 / M52B20-25-28 (Size 0.25) Main Bearing Set

Name: King Engine Bearings BMW M20B20-23-25-27 / M50B25 / M52B20-25-28 (Size 0.25) Main Bearing Set
Brand: King Engine Bearings
Price: 107.03 USD
Availability: InStock

$107.03

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

King Engine Bearings main bearing set for BMW M20/M50/M52 engines. Features lead-free composite and bi-metal aluminum material.

Key Features

Fits BMW M20B20-23-25-27, M50B25, and M52B20-25-28 engines.
This is a 0.25mm undersize main bearing set.
Constructed with a bi-metal aluminum material.
Features a lead-free, environmentally safe composite.
Ideal for low to 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

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

King Engine Bearings has been specializing in engine bearings since 1960, aiming to supply the highest quality available. This main bearing set, part number MB798AM0.25, is designed for a range of BMW engines including the M20B20-23-25-27, M50B25, and M52B20-25-28. It's built with a bi-metal aluminum material and features a lead-free, environmentally safe composite, making it ideal for low to medium-load engines.

This set is 0.25mm undersize, meaning it's intended for crankshafts that have been machined down by that amount during a rebuild. The lead-free composite construction is a notable feature, offering an environmentally conscious option while still performing well in applications like the BMW 325i, 525i, or Z3 models. These bearings are a solid option when you're rebuilding the bottom end of these specific BMW engines.