Main Bearings
Circle Track Main Bearings at JJ Motorsports
Main bearings support the crankshaft's weight and rotation, providing durability and stability under high loads in circle track racing. Designed for late models, modifieds, and street stocks, these bearings ensure consistent performance and longevity in demanding IMCA, USMTS, and dirt oval conditions, available in coated and extra clearance options for Small Block Ford and GM LS-Series engines.
Shop trusted brands like MAHLE ORIGINAL/CLEVITE for coated H-Series sets, KING BEARINGS for high-performance options, and ACL BEARINGS for reliable bearings. Explore related categories such as Circle Track Engine Bearings for complete bearing solutions or Circle Track Engines and Components for additional upgrades.
Top Circle Track Main Bearings
- Coated Main Bearing Set MS-590HC – Main Bearing H-Series Standard Coated Small Block Ford.
- Main Bearing Set GM LS MS-2411HX – Main Bearings H-Series Standard Extra Oil Clearance GM LS-Series.
- Main Bearing Set GM LS Coated MS-2411HC – Main Bearings H-Series Standard Coated GM LS-Series.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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Main Bearing Set 140M
SEALED POWER
$85.99Main bearing wear is one of the fastest ways to compromise engine reliability and performance—especially under high RPM or boost conditions. The Speed Pro 140M Main Bearing Set delivers the precision clearances and material durability your Small Block...SEA140M- SKU:
- SEA140M
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- MFG Part #:
- 140M
$85.99 -
Main Bearing Set SEA139M11
SEALED POWER
$84.99A quality main bearing set is foundational to engine reliability and longevity, especially in high-performance or rebuilt applications. Speed Pro's main bearing kit ensures proper oil clearance and load distribution across critical engine journals,...SEA139M11- SKU:
- SEA139M11
- Availability:
- Ships Same Business Day
- Weight:
- 1.32 LBS
- MFG Part #:
- 139M11
$84.99 -
Main Bearing Set SEA139M10
SEALED POWER
$77.99A worn or damaged main bearing set directly compromises engine reliability and power delivery—especially critical if you're running boosted power or high RPM applications. This Speed Pro kit delivers OEM-quality bearing surfaces with precise tolerances,...SEA139M10- SKU:
- SEA139M10
- Availability:
- Ships Same Business Day
- Weight:
- 1.29 LBS
- MFG Part #:
- 139M10
$77.99 -
Main Bearing Set SEA139M1
SEALED POWER
$75.99Main bearing wear is one of the fastest ways to lose engine reliability and power output under load. The SEA139M1 delivers precision-engineered construction that maintains critical clearances and oil film integrity, whether you're pushing your small...SEA139M1- SKU:
- SEA139M1
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- MFG Part #:
- 139M1
$75.99 -
Main Bearing Set 139M
SEALED POWER
$77.99Main bearing wear is one of the most critical failure points in high-performance engines—inadequate bearing support under load leads to crankshaft deflection, increased friction, and catastrophic engine damage. The Main Bearing Set 139M delivers...SEA139M- SKU:
- SEA139M
- Availability:
- Ships Same Business Day
- Weight:
- 1.29 LBS
- MFG Part #:
- 139M
$77.99Qty in Cart: 0Quantity:Price:$77.99Subtotal: -
Main Bearing Set SEA130M1X
SEALED POWER
$89.99A quality main bearing set is foundational to engine longevity and reliability—especially in high-rpm applications where journal wear accelerates quickly. This Speed Pro kit delivers OEM-grade precision with factory-spec tolerances, ensuring proper oil...SEA130M1X- SKU:
- SEA130M1X
- Availability:
- Ships Same Business Day
- Weight:
- 1.47 LBS
- MFG Part #:
- 130M1X
$89.99 -
Main Bearing Set SEA130M10
SEALED POWER
$89.99A precision main bearing set is the foundation of engine reliability and longevity. If your small block Ford is running worn or damaged mains, you're risking catastrophic failure—proper bearing clearances are non-negotiable for consistent power delivery...SEA130M10- SKU:
- SEA130M10
- Availability:
- Ships Same Business Day
- Weight:
- 1.52 LBS
- MFG Part #:
- 130M10
$89.99 -
Main Bearing Set 130M
SEALED POWER
$89.99A quality main bearing set is the foundation of a reliable, long-lasting engine—especially when you're pushing performance limits. The Speed Pro 130M delivers OEM-grade precision and durability for Small Block Ford builds, ensuring consistent oil...SEA130M- SKU:
- SEA130M
- Availability:
- Ships Same Business Day
- Weight:
- 1.48 LBS
- MFG Part #:
- 130M
$89.99 -
Main Bearing Set 129M
SEALED POWER
$97.99Main bearing failure is one of the quickest ways to turn a running engine into scrap metal. The Speed Pro 129M Main Bearing Set delivers OEM-grade reliability with the precision tolerances needed to handle sustained high-RPM operation in Small Block Ford...SEA129M- SKU:
- SEA129M
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- MFG Part #:
- 129M
$97.99 -
Main Bearing Set MS-981P-20
MICHIGAN 77
$83.99A proper main bearing set is critical for engine longevity and reliable power delivery—inadequate bearings lead to catastrophic failure and expensive rebuilds. The MS-981P-20 delivers precision-engineered construction specifically designed for Ford...M77MS981P20- SKU:
- M77MS981P20
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
- MFG Part #:
- MS981P20
$83.99 -
Main Bearing Set MS-981P-10
MICHIGAN 77
$88.99Main bearing wear is one of the fastest ways to compromise engine reliability and performance. The MS-981P-10 delivers the precision fit and load-carrying capacity your Ford engine needs to handle sustained RPMs and maintain tight clearances under stress...M77MS981P10- SKU:
- M77MS981P10
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- MFG Part #:
- MS981P10
$88.99 -
Main Bearing Set MS-981P
MICHIGAN 77
$84.99Main bearing wear is one of the most catastrophic failure points in any engine—and once they go, your entire bottom end is compromised. The MS-981P delivers OEM-grade precision and durability, keeping your crankshaft properly supported under extreme...M77MS981P- SKU:
- M77MS981P
- Availability:
- Ships Same Business Day
- Weight:
- 1.34 LBS
- MFG Part #:
- MS981P
$84.99 -
Main Bearing Set MS-981H
MICHIGAN 77
$103.99Main bearing wear is one of the most critical factors affecting engine longevity and reliability under sustained load. The MS-981H delivers OEM-quality construction with precise tolerances, ensuring proper oil film strength and reduced crankshaft...M77MS981H- SKU:
- M77MS981H
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- MFG Part #:
- MS981H
$103.99 -
Main Bearing Set MS-909P-30
MICHIGAN 77
$58.99A properly sized main bearing set is critical for engine longevity and reliable power delivery, especially in high-RPM or boosted applications where tolerances are tight. The MS-909P-30 is engineered for small block Chevy engines that have been bored or...M77MS909P30- SKU:
- M77MS909P30
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- MFG Part #:
- MS909P30
$58.99 -
Main Bearing Set MS-909P-20
MICHIGAN 77
$78.99A worn or damaged main bearing set will compromise your entire engine's structural integrity, leading to catastrophic failure under load. The MS-909P-20 delivers precision-engineered bearings that maintain proper crankshaft clearances and support...M77MS909P20- SKU:
- M77MS909P20
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- MFG Part #:
- MS909P20
$78.99 -
Main Bearing Set MS-909P-10
MICHIGAN 77
$78.99Main bearing wear is one of the most destructive failures in high-performance engines—and catching it too late means catastrophic damage. The MS-909P-10 is engineered to restore critical bearing clearances in P-Series Small Block Chevy applications,...M77MS909P10- SKU:
- M77MS909P10
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
- MFG Part #:
- MS909P10
$78.99 -
Main Bearing Set MS-909P-1
MICHIGAN 77
$78.99Main bearing wear or failure can compromise your entire engine's structural integrity and performance—replacing them with precision-manufactured bearings is essential for reliability and longevity. The MS-909P-1 delivers tight tolerances and consistent...M77MS909P1- SKU:
- M77MS909P1
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
- MFG Part #:
- MS909P1
$78.99Qty in Cart: 0Quantity:Price:$78.99Subtotal: -
Main Bearing Set MS-909P
MICHIGAN 77
$78.99Main bearing failure can sideline your engine when you need it most. The MS-909P delivers the precision fit and material quality required for reliable power delivery, whether you're rebuilding stock or pushing performance limits. This complete set...M77MS909P- SKU:
- M77MS909P
- Availability:
- Ships Same Business Day
- Weight:
- 1.22 LBS
- MFG Part #:
- MS909P
$78.99 -
Main Bearing Set MS-909HX
MICHIGAN 77
$99.99Main bearings are the foundation of engine reliability—they control crankshaft clearance and oil distribution under extreme loads. The MS-909HX delivers precision-engineered geometry with optimized clearances to support sustained high RPM operation while...M77MS909HX- SKU:
- M77MS909HX
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- MFG Part #:
- MS909HX
$99.99 -
Main Bearing Set MS-909H-9
MICHIGAN 77
$98.99Precision main bearings are the foundation of engine reliability—they manage critical loads and maintain strict clearances that directly impact power output and longevity. The MS-909H-9 is engineered for Small Block Chevy builds that demand OEM-grade...M77MS909H9- SKU:
- M77MS909H9
- Availability:
- Ships Same Business Day
- Weight:
- 1.29 LBS
- MFG Part #:
- MS909H9
$98.99
