What does the +0.26mm sizing mean for these bearings?

The +0.26mm sizing indicates that these bearings are slightly larger in diameter than the original factory bearings. This is used when the crankshaft journals have been machined down, and a larger bearing is needed to maintain the correct oil clearance.

What is the primary function of main bearings in an engine?

Main bearings support the crankshaft within the engine block. They allow the crankshaft to rotate smoothly while maintaining the critical oil clearance needed for lubrication and to prevent metal-on-metal contact.

Are these bearings suitable for a stock crankshaft?

No, these bearings are specifically sized at +0.26mm and are intended for use with a crankshaft that has been machined down by 0.26mm from its original size. Using them on a stock crankshaft would result in incorrect oil clearance.

Specifications

Brand: King Engine Bearings
Part #: MB7779MC.026
UPC: 611500626753

King Engine Bearings Toyota Supra B58 Main Bearing Set - Size +0.26mm

Name: King Engine Bearings Toyota Supra B58 Main Bearing Set - Size +0.26mm
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-toyota-supra-b58-main-bearing-set-size-t14-432602
Price: 119.27 USD
Availability: BackOrder

$119.27

On Backorder — Expected to ship by May 3, 2026

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

Key Features

This is a main bearing set for the Toyota Supra B58 engine.
The bearings are sized at +0.26mm, which is 0.26mm larger than the standard size.
This set is designed to be used with a crankshaft that has been machined down to a smaller size.
King Engine Bearings are known for their durability and performance.

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About this part

Product Details

If you're rebuilding the engine in your Toyota Supra with the B58 engine, this King Engine Bearings Main Bearing Set is a solid option. These bearings are sized at +0.26mm, meaning they are a slightly larger diameter than stock. This is typically used when the crankshaft journals have been machined down to clean them up after wear or damage, and you need a bearing to match the new, smaller journal size. King is known for making well-built engine bearings that hold up to the demands of performance and daily driving.

This set includes the main bearings needed for your B58 engine. King uses advanced materials and manufacturing processes to ensure their bearings have excellent fatigue strength and embeddability, which helps protect your crankshaft. The precise sizing ensures proper oil clearance, which is critical for engine longevity and performance. When installing, always refer to the manufacturer's torque specifications and assembly lube recommendations to ensure a successful rebuild.