What does the STDX size mean for these bearings?

The STDX designation indicates that these are undersize bearings. They are designed to be used when the crankshaft journals have been machined down by 0.040 inches (or 1mm) to account for wear or resurfacing.

What is PMaxBlack technology?

PMaxBlack is a proprietary technology developed by King Engine Bearings. It's designed to enhance the bearing's ability to handle higher loads, making it suitable for performance applications where engines are subjected to greater stress.

Does this bearing set come with all the necessary components for installation?

This product is a main bearing set. It includes the main bearings themselves. You will need to ensure you have all other necessary components for your engine rebuild, such as crankshaft thrust bearings and assembly lubricant, before installation.

Specifications

Brand: King Engine Bearings
Part #: MB5220XPSTDX
UPC: 611500542213

King Subaru WRX/STi EJ20 EJ22 EJ25 Flange #3 Position Performance Main Bearing Set - Size STDX

Name: King Subaru WRX/STi EJ20 EJ22 EJ25 Flange #3 Position Performance Main Bearing Set - Size STDX
Brand: King Engine Bearings
SKU: king-engine-bearings-king-subaru-wrx-sti-ej20-ej22-ej25-flange-3-position-perfor-t14-4333170
Price: 103.54 USD
Availability: BackOrder

$103.54

On Backorder — Expected to ship by Sep 16, 2026

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

King Engine Bearings performance main bearing set for Subaru WRX/STi EJ20, EJ22, EJ25. Size STDX.

Key Features

Fits a wide range of Subaru WRX/STi models with EJ20, EJ22, and EJ25 engines, including Saab 9-2X, Subaru Baja, Forester, Impreza, Legacy, Outback, and WRX STI.
Features PMaxBlack technology for superior load capacity.
Includes Radialock for optimal crush height.
Constructed with a tri-metal copper-based material for durability.
This is the STDX size, which is an undersize bearing for crankshaft journals.

⚠️ 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

King Engine Bearings has been a specialist in engine bearings since 1960, focusing on supplying the highest quality bearings available. This performance main bearing set is specifically made for Subaru WRX/STi models with EJ20, EJ22, and EJ25 engines, fitting a wide range of vehicles including the Subaru Impreza, Legacy, and Forester.

This set utilizes King's PMaxBlack technology, which offers superior load capacity, and their Radialock feature for optimal crush height. The tri-metal copper-based material is well-built for demanding engine conditions, ensuring reliable performance and durability for your Subaru's engine.

This particular set is sized STDX, which is an undersize bearing. Always ensure you are using the correct bearing size for your engine's crankshaft journals during rebuild.