S&S Cycle MK-Series Crankcase Assembly - Black — Fits 2018+ Harley-Davidson M8 Softail

SKU: SSC310-1326
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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 S&S Cycle

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

Watch in action

Premium S&S Cycle MK-Series Crankcase for M8 Softail

Transform your 2018 and newer Harley-Davidson M8 Softail with the robust and high-performance S&S Cycle MK-Series Crankcase Assembly. Engineered with S&S Cycle's legendary precision and commitment to quality, this crankcase is designed to be the foundation for your ultimate M8 build. It offers superior strength and reliability, ensuring your engine can handle increased power demands whether you're cruising the highway or pushing performance limits.

Engineered for Excellence:

  • MK-Series Crankcase: A premium, high-performance crankcase assembly from S&S Cycle.
  • Designed for 2018+ M8 Softail Models: Ensures a precise fit for a wide range of compatible Harley-Davidson Softail motorcycles.
  • Superior Strength & Durability: Built to withstand the rigors of high-performance riding and demanding conditions.
  • Optimized for Performance: Provides a solid foundation for engine builds focused on power and reliability.
  • Direct Replacement or Upgrade: Ideal for replacing a damaged crankcase or upgrading for enhanced performance.
  • S&S Cycle Quality: Manufactured to the highest standards for unmatched performance and longevity.

The S&S Cycle MK-Series Crankcase Assembly is a critical component for any serious M8 Softail enthusiast. Its robust construction ensures the integrity of your engine, even under extreme stress. This assembly is meticulously crafted to meet the exacting specifications required for optimal engine function, providing a significant upgrade over stock components. Whether you are rebuilding your engine or aiming for a custom high-performance build, this crankcase offers the reliability and performance edge that S&S Cycle is known for. Invest in the best for your ride. Discover the S&S Cycle difference at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2018-2020 Harley-Davidson FLDE Deluxe 107 Base
2018-2019 Harley-Davidson FLFB Fat Boy 107 Base
2025 Harley-Davidson FLFB Fat Boy 117 Base
2018-2023 Harley-Davidson FLFBS Fat Boy 114 Base
2018-2021 Harley-Davidson FLHC Heritage Classic 107 Base
2018-2024 Harley-Davidson FLHCS Heritage Classic 114 Base
2018 Harley-Davidson FLSB Sport Glide 107 Base
2020-2021 Harley-Davidson FLSB Sport Glide 107 Base
2018 Harley-Davidson FLSL Softail Slim 107 Base
2020-2021 Harley-Davidson FLSL Softail Slim 107 Base
2025 Harley-Davidson FLSTFI Fat Boy Gray Ghost Base
2018-2020 Harley-Davidson FXBB Street Bob 107 Base
2025 Harley-Davidson FXBB Street Bob 117 Base
2021-2024 Harley-Davidson FXBBS Street Bob 114 Base
2018-2019 Harley-Davidson FXBR Breakout 107 Base
2023-2025 Harley-Davidson FXBR Breakout 117 Base
2018-2020 Harley-Davidson FXBRS Breakout 114 Base
2019-2020 Harley-Davidson FXDRS FXDR 114 Base
2018-2019 Harley-Davidson FXFB Fat Bob 107 Base
2018-2023 Harley-Davidson FXFBS Fat Bob 114 Base
2018-2020 Harley-Davidson FXLR Low Rider 107 Base
2020-2021 Harley-Davidson FXLRS Low Rider S 114 Base
2022-2025 Harley-Davidson FXLRS Low Rider S 117 Base
2022-2025 Harley-Davidson FXLRST Low Rider ST 117 Base
2022 Harley-Davidson FXRST Low Rider El Diablo 117 Base
2020-2024 Harley-Davidson FXST Softail Standard 107 Base

Product Details

Product Description
Part Numbers
Sizing & Fit

About S&S Cycle

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

Watch in action

Premium S&S Cycle MK-Series Crankcase for M8 Softail

Transform your 2018 and newer Harley-Davidson M8 Softail with the robust and high-performance S&S Cycle MK-Series Crankcase Assembly. Engineered with S&S Cycle's legendary precision and commitment to quality, this crankcase is designed to be the foundation for your ultimate M8 build. It offers superior strength and reliability, ensuring your engine can handle increased power demands whether you're cruising the highway or pushing performance limits.

Engineered for Excellence:

  • MK-Series Crankcase: A premium, high-performance crankcase assembly from S&S Cycle.
  • Designed for 2018+ M8 Softail Models: Ensures a precise fit for a wide range of compatible Harley-Davidson Softail motorcycles.
  • Superior Strength & Durability: Built to withstand the rigors of high-performance riding and demanding conditions.
  • Optimized for Performance: Provides a solid foundation for engine builds focused on power and reliability.
  • Direct Replacement or Upgrade: Ideal for replacing a damaged crankcase or upgrading for enhanced performance.
  • S&S Cycle Quality: Manufactured to the highest standards for unmatched performance and longevity.

The S&S Cycle MK-Series Crankcase Assembly is a critical component for any serious M8 Softail enthusiast. Its robust construction ensures the integrity of your engine, even under extreme stress. This assembly is meticulously crafted to meet the exacting specifications required for optimal engine function, providing a significant upgrade over stock components. Whether you are rebuilding your engine or aiming for a custom high-performance build, this crankcase offers the reliability and performance edge that S&S Cycle is known for. Invest in the best for your ride. Discover the S&S Cycle difference at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2018-2020 Harley-Davidson FLDE Deluxe 107 Base
2018-2019 Harley-Davidson FLFB Fat Boy 107 Base
2025 Harley-Davidson FLFB Fat Boy 117 Base
2018-2023 Harley-Davidson FLFBS Fat Boy 114 Base
2018-2021 Harley-Davidson FLHC Heritage Classic 107 Base
2018-2024 Harley-Davidson FLHCS Heritage Classic 114 Base
2018 Harley-Davidson FLSB Sport Glide 107 Base
2020-2021 Harley-Davidson FLSB Sport Glide 107 Base
2018 Harley-Davidson FLSL Softail Slim 107 Base
2020-2021 Harley-Davidson FLSL Softail Slim 107 Base
2025 Harley-Davidson FLSTFI Fat Boy Gray Ghost Base
2018-2020 Harley-Davidson FXBB Street Bob 107 Base
2025 Harley-Davidson FXBB Street Bob 117 Base
2021-2024 Harley-Davidson FXBBS Street Bob 114 Base
2018-2019 Harley-Davidson FXBR Breakout 107 Base
2023-2025 Harley-Davidson FXBR Breakout 117 Base
2018-2020 Harley-Davidson FXBRS Breakout 114 Base
2019-2020 Harley-Davidson FXDRS FXDR 114 Base
2018-2019 Harley-Davidson FXFB Fat Bob 107 Base
2018-2023 Harley-Davidson FXFBS Fat Bob 114 Base
2018-2020 Harley-Davidson FXLR Low Rider 107 Base
2020-2021 Harley-Davidson FXLRS Low Rider S 114 Base
2022-2025 Harley-Davidson FXLRS Low Rider S 117 Base
2022-2025 Harley-Davidson FXLRST Low Rider ST 117 Base
2022 Harley-Davidson FXRST Low Rider El Diablo 117 Base
2020-2024 Harley-Davidson FXST Softail Standard 107 Base

Product Details

Product Description

About S&S Cycle

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

Watch in action

Premium S&S Cycle MK-Series Crankcase for M8 Softail

Transform your 2018 and newer Harley-Davidson M8 Softail with the robust and high-performance S&S Cycle MK-Series Crankcase Assembly. Engineered with S&S Cycle's legendary precision and commitment to quality, this crankcase is designed to be the foundation for your ultimate M8 build. It offers superior strength and reliability, ensuring your engine can handle increased power demands whether you're cruising the highway or pushing performance limits.

Engineered for Excellence:

  • MK-Series Crankcase: A premium, high-performance crankcase assembly from S&S Cycle.
  • Designed for 2018+ M8 Softail Models: Ensures a precise fit for a wide range of compatible Harley-Davidson Softail motorcycles.
  • Superior Strength & Durability: Built to withstand the rigors of high-performance riding and demanding conditions.
  • Optimized for Performance: Provides a solid foundation for engine builds focused on power and reliability.
  • Direct Replacement or Upgrade: Ideal for replacing a damaged crankcase or upgrading for enhanced performance.
  • S&S Cycle Quality: Manufactured to the highest standards for unmatched performance and longevity.

The S&S Cycle MK-Series Crankcase Assembly is a critical component for any serious M8 Softail enthusiast. Its robust construction ensures the integrity of your engine, even under extreme stress. This assembly is meticulously crafted to meet the exacting specifications required for optimal engine function, providing a significant upgrade over stock components. Whether you are rebuilding your engine or aiming for a custom high-performance build, this crankcase offers the reliability and performance edge that S&S Cycle is known for. Invest in the best for your ride. Discover the S&S Cycle difference at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2018-2020 Harley-Davidson FLDE Deluxe 107 Base
2018-2019 Harley-Davidson FLFB Fat Boy 107 Base
2025 Harley-Davidson FLFB Fat Boy 117 Base
2018-2023 Harley-Davidson FLFBS Fat Boy 114 Base
2018-2021 Harley-Davidson FLHC Heritage Classic 107 Base
2018-2024 Harley-Davidson FLHCS Heritage Classic 114 Base
2018 Harley-Davidson FLSB Sport Glide 107 Base
2020-2021 Harley-Davidson FLSB Sport Glide 107 Base
2018 Harley-Davidson FLSL Softail Slim 107 Base
2020-2021 Harley-Davidson FLSL Softail Slim 107 Base
2025 Harley-Davidson FLSTFI Fat Boy Gray Ghost Base
2018-2020 Harley-Davidson FXBB Street Bob 107 Base
2025 Harley-Davidson FXBB Street Bob 117 Base
2021-2024 Harley-Davidson FXBBS Street Bob 114 Base
2018-2019 Harley-Davidson FXBR Breakout 107 Base
2023-2025 Harley-Davidson FXBR Breakout 117 Base
2018-2020 Harley-Davidson FXBRS Breakout 114 Base
2019-2020 Harley-Davidson FXDRS FXDR 114 Base
2018-2019 Harley-Davidson FXFB Fat Bob 107 Base
2018-2023 Harley-Davidson FXFBS Fat Bob 114 Base
2018-2020 Harley-Davidson FXLR Low Rider 107 Base
2020-2021 Harley-Davidson FXLRS Low Rider S 114 Base
2022-2025 Harley-Davidson FXLRS Low Rider S 117 Base
2022-2025 Harley-Davidson FXLRST Low Rider ST 117 Base
2022 Harley-Davidson FXRST Low Rider El Diablo 117 Base
2020-2024 Harley-Davidson FXST Softail Standard 107 Base

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