ACL Mazda B6/BP 0.25mm Oversized Race Series Main Bearings — Fits 1986-2005 Mazda & Kia

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SKU: ACL5M8353H-.25
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About ACL

ACL engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full ACL lineup with fast shipping and expert fitment support — order with confidence.

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ACL 0.25mm Oversized Main Bearings for Mazda B6/BP

The Mazda B6 and BP engine platforms are legendary for their reliability and potential for tuning. When it comes time to rebuild your engine, the ACL 0.25mm Oversized Main Bearing Set is the professional choice for a ground crankshaft. These bearings are engineered to provide the tight tolerances and high load-bearing capacity required for both street and track performance.

Technical Specifications

  • Precision Engineering: Designed for 0.25mm oversized crankshaft journals to ensure perfect oil clearance.
  • Tri-Metal Design: Combines a steel backing with a high-strength overlay for maximum durability.
  • Universal Compatibility: Fits a wide range of B6 and BP engines, including those found in the Mazda Miata, Protege, and 323.
  • Reduced Wear: Engineered to minimize friction and prevent premature failure in high-output applications.

Whether you are building a naturally aspirated Miata for autocross or a turbocharged BP engine for track days, these bearings provide the structural foundation your engine needs. They are also compatible with various Kia Sephia and Mercury Capri models, making them a versatile choice for classic engine builds. Don't settle for less when it comes to your engine's heart. Get the performance and reliability you deserve at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2001-2005 Kia Rio Base
2002-2005 Kia Rio Cinco
1994-1997 Kia Sephia GS
1994-1997 Kia Sephia LS
1994-1997 Kia Sephia RS
1986-1988 Mazda 323 DX
1986-1989 Mazda 323 LX
1986-1994 Mazda 323 Base
1988 Mazda 323 GT
1988-1989 Mazda 323 GTX
1992-1995 Mazda MX-3 Base
1990-1997 Mazda Miata Base
1991 Mazda Miata SE
1993 Mazda Miata LE
1994-1997 Mazda Miata M Edition
1997 Mazda Miata STO
1999 Mazda Miata 10th Anniversary
1999-2005 Mazda Miata Base
2000-2003 Mazda Miata SE
2000-2005 Mazda Miata LS
2004-2005 Mazda Miata Mazdaspeed
1990-2001 Mazda Protege LX
1995-2000 Mazda Protege ES
1995-2001 Mazda Protege DX
1991-1994 Mercury Capri Base
1991-1994 Mercury Capri XR2

Product Details

Product Description
Part Numbers
Sizing & Fit

About ACL

ACL engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full ACL lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

ACL 0.25mm Oversized Main Bearings for Mazda B6/BP

The Mazda B6 and BP engine platforms are legendary for their reliability and potential for tuning. When it comes time to rebuild your engine, the ACL 0.25mm Oversized Main Bearing Set is the professional choice for a ground crankshaft. These bearings are engineered to provide the tight tolerances and high load-bearing capacity required for both street and track performance.

Technical Specifications

  • Precision Engineering: Designed for 0.25mm oversized crankshaft journals to ensure perfect oil clearance.
  • Tri-Metal Design: Combines a steel backing with a high-strength overlay for maximum durability.
  • Universal Compatibility: Fits a wide range of B6 and BP engines, including those found in the Mazda Miata, Protege, and 323.
  • Reduced Wear: Engineered to minimize friction and prevent premature failure in high-output applications.

Whether you are building a naturally aspirated Miata for autocross or a turbocharged BP engine for track days, these bearings provide the structural foundation your engine needs. They are also compatible with various Kia Sephia and Mercury Capri models, making them a versatile choice for classic engine builds. Don't settle for less when it comes to your engine's heart. Get the performance and reliability you deserve at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2001-2005 Kia Rio Base
2002-2005 Kia Rio Cinco
1994-1997 Kia Sephia GS
1994-1997 Kia Sephia LS
1994-1997 Kia Sephia RS
1986-1988 Mazda 323 DX
1986-1989 Mazda 323 LX
1986-1994 Mazda 323 Base
1988 Mazda 323 GT
1988-1989 Mazda 323 GTX
1992-1995 Mazda MX-3 Base
1990-1997 Mazda Miata Base
1991 Mazda Miata SE
1993 Mazda Miata LE
1994-1997 Mazda Miata M Edition
1997 Mazda Miata STO
1999 Mazda Miata 10th Anniversary
1999-2005 Mazda Miata Base
2000-2003 Mazda Miata SE
2000-2005 Mazda Miata LS
2004-2005 Mazda Miata Mazdaspeed
1990-2001 Mazda Protege LX
1995-2000 Mazda Protege ES
1995-2001 Mazda Protege DX
1991-1994 Mercury Capri Base
1991-1994 Mercury Capri XR2

Product Details

Product Description

About ACL

ACL engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full ACL lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

ACL 0.25mm Oversized Main Bearings for Mazda B6/BP

The Mazda B6 and BP engine platforms are legendary for their reliability and potential for tuning. When it comes time to rebuild your engine, the ACL 0.25mm Oversized Main Bearing Set is the professional choice for a ground crankshaft. These bearings are engineered to provide the tight tolerances and high load-bearing capacity required for both street and track performance.

Technical Specifications

  • Precision Engineering: Designed for 0.25mm oversized crankshaft journals to ensure perfect oil clearance.
  • Tri-Metal Design: Combines a steel backing with a high-strength overlay for maximum durability.
  • Universal Compatibility: Fits a wide range of B6 and BP engines, including those found in the Mazda Miata, Protege, and 323.
  • Reduced Wear: Engineered to minimize friction and prevent premature failure in high-output applications.

Whether you are building a naturally aspirated Miata for autocross or a turbocharged BP engine for track days, these bearings provide the structural foundation your engine needs. They are also compatible with various Kia Sephia and Mercury Capri models, making them a versatile choice for classic engine builds. Don't settle for less when it comes to your engine's heart. Get the performance and reliability you deserve at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2001-2005 Kia Rio Base
2002-2005 Kia Rio Cinco
1994-1997 Kia Sephia GS
1994-1997 Kia Sephia LS
1994-1997 Kia Sephia RS
1986-1988 Mazda 323 DX
1986-1989 Mazda 323 LX
1986-1994 Mazda 323 Base
1988 Mazda 323 GT
1988-1989 Mazda 323 GTX
1992-1995 Mazda MX-3 Base
1990-1997 Mazda Miata Base
1991 Mazda Miata SE
1993 Mazda Miata LE
1994-1997 Mazda Miata M Edition
1997 Mazda Miata STO
1999 Mazda Miata 10th Anniversary
1999-2005 Mazda Miata Base
2000-2003 Mazda Miata SE
2000-2005 Mazda Miata LS
2004-2005 Mazda Miata Mazdaspeed
1990-2001 Mazda Protege LX
1995-2000 Mazda Protege ES
1995-2001 Mazda Protege DX
1991-1994 Mercury Capri Base
1991-1994 Mercury Capri XR2

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