Product images and videos are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

King Racing

Main Bearings

Name: Main Bearings
Brand: King Racing
SKU: MB4058XP
Price: 72.99 USD
Availability: InStock

$72.99

SKU: MB4058XP

In Stock

Ships by Sep 12

Free Shipping over $200

$100 Minimum Order

30 Days Return

Description

The King Racing MB4058XP is a set of main bearings engineered for the demanding conditions of high-load, long-duration racing, including circle track, off-road, and off-shore applications that require steel crankshafts. These bearings are part of the XP high-performance series, developed to meet the increasing load capacities demanded by successful race engine builders. Constructed with an enhanced tri-metal copper lead composition, these bearings feature a nickel barrier and SecureBond adhesion, providing superior stability between the top and intermediate layers. This construction offers a 15% to 30% greater load capacity compared to traditional bearings. Additionally, a 0.0005" metallurgically enhanced and hardened performance overlay is applied to withstand greater loads and resist surface fatigue. The main bearings are designed with a 1/2 groove for uncompromised lower shell load capacity. King Racing's XP series incorporates pMax Black, a unique tri-metal structure that is 24% harder than conventional tri-metal race bearings. Combined with the XP geometric features, these bearings are an ideal choice for performance racing applications utilizing forged steel aftermarket crankshafts that produce high loads for extended periods.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

Brand	King Racing
Part Number	MB4058XP
Category	Engines and Components

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy