What does the .25 size mean for these main bearings?

The .25 size indicates that these bearings are 0.00025 inches undersize. This means they are intended for use when the crankshaft journals have been machined down by that specific amount during an engine rebuild.

What is the Tri-M+ babbit overlay?

The Tri-M+ babbit overlay is an enhanced layer applied to the bearing surface. It's designed to improve the bearing's ability to conform to the crankshaft and handle load, contributing to better engine performance and longevity.

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

These bearings are described as ideal for medium-load engines. While they are well-built and designed for durability, for extreme racing applications, it's always best to consult with a specialist to ensure the chosen components meet the specific demands of your build.

King Engine Bearings BMW S85B50A Main Bearing Set (Size .25)

Specifications

Brand: King Engine Bearings
Part #: MB637CA0.25
UPC: 611500598418

King Engine Bearings BMW S85B50A Main Bearing Set (Size .25)

Name: King Engine Bearings BMW S85B50A Main Bearing Set (Size .25)
Brand: King Engine Bearings
Price: 274.60 USD
Availability: InStock

$274.60

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Fits 2006-2010 BMW M5. King Engine Bearings main bearing set (.25 size) uses a tri-metal copper-based material for improved durability.

Key Features

Fits 2006-2010 BMW M5 and 2006-2010 BMW M6.
Main bearing set is sized .25, meaning it is 0.00025 inches undersize.
Constructed with a tri-metal copper-based material for durability.
Features a Tri-M+ enhanced babbit overlay for improved performance.
Designed for medium-load engines like the BMW S85B50A.

⚠️ 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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Fits these vehicles

BMW M5 2006-2010
BMW M6 2006-2010

Product Details

Built with a tri-metal copper-based material and a Tri-M+ enhanced babbit overlay, this main bearing set from King Engine Bearings is specifically made for the S85B50A engine found in the 2006-2010 BMW M5. As bearing specialists since 1960, King focuses on supplying well-built engine bearings, and this set is designed for medium-load applications, offering a solid option for your engine rebuild.

This set is sized at .25, meaning it's intended for crankshaft journals that have been machined down by 0.00025 inches. Using the correct bearing size is crucial for maintaining proper oil clearance, which is essential for engine longevity and performance. King's specialized approach to bearing manufacturing ensures a high-quality component for your M5's critical bottom end.