S&S Cycle 2017 M8 Models 4-1/2in Stroke Flywheel w/ Tapered Rods & Balancer Gear

The flywheels are the heart of any performance engine and S&S Cycle has been perfecting the art for over six decades. Stronger, more durable, and trued to a spec others can only dream of, the new cranks for the Milwaukee-Eight® platform are the best of the best to build your high performance engine around.

• S&S High Strength Connecting Rods are designed with Finite Element Analysis to eliminate weak spots and handle more power!
• Heat Treated 4140 Material is harder & more than twice as strong as stock
• Tapered wristpin connecting rods compatible with stock pistons
• Stronger assembly eliminates need to weld crankpin
• Capable of higher RPM - More available power!
• Balanced for stock piston weight (1060g)
• Consistent balance & precision machining
• 4-1/2" Stroke (114 or 128ci)
• Perfect for Gear Drive Cams
• Balance Gear installed

The S&S Cycle 2017 Milwaukee-Eight flywheel is engineered for high-performance Harley-Davidson models, delivering exceptional strength and durability. Designed with over six decades of expertise, this flywheel features a robust construction that ensures reliable operation under demanding conditions. It includes tapered wristpin connecting rods compatible with stock pistons, allowing for seamless integration into your existing engine setup. The heat-treated 4140 steel construction offers more than twice the strength of stock components, providing increased resistance to wear and power stress.

This flywheel is balanced for stock piston weight and features precise machining to maintain consistent balance, which is crucial for smooth engine operation and longevity. With a 4-1/2

Fitment:
Harley Davidson FLDE Deluxe 107 Base 2018
Harley Davidson FLDE Deluxe 107 Base 2019
Harley Davidson FLDE Deluxe 107 Base 2020
Harley Davidson FLFB Fat Boy 107 Base 2018
Harley Davidson FLFB Fat Boy 107 Base 2019
Harley Davidson FLFBS Fat Boy 114 Base 2018
Harley Davidson FLFBS Fat Boy 114 Base 2019
Harley Davidson FLFBS Fat Boy 114 Base 2020
Harley Davidson FLFBS Fat Boy 114 Base 2021
Harley Davidson FLH Electra Glide Revival Base 2021
Harley Davidson FLHC Heritage Classic 107 Base 2018
Harley Davidson FLHC Heritage Classic 107 Base 2019
Harley Davidson FLHC Heritage Classic 107 Base 2020
Harley Davidson FLHC Heritage Classic 107 Base 2021
Harley Davidson FLHCS Heritage Classic 114 Base 2018
Harley Davidson FLHCS Heritage Classic 114 Base 2019
Harley Davidson FLHCS Heritage Classic 114 Base 2020
Harley Davidson FLHCS Heritage Classic 114 Base 2021
Harley Davidson FLHR Road King Base 2017
Harley Davidson FLHR Road King Base 2018
Harley Davidson FLHR Road King Base 2019
Harley Davidson FLHR Road King Base 2020
Harley Davidson FLHR Road King Base 2021
Harley Davidson FLHRXS Road King Special Base 2017
Harley Davidson FLHRXS Road King Special Base 2018
Harley Davidson FLHRXS Road King Special Base 2019
Harley Davidson FLHRXS Road King Special Base 2020
Harley Davidson FLHRXS Road King Special Base 2021
Harley Davidson FLHT Electra Glide Standard Base 2019
Harley Davidson FLHT Electra Glide Standard Base 2020
Harley Davidson FLHT Electra Glide Standard Base 2021
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 2017
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 2018
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 2019
Harley Davidson FLHTCUTG Tri Glide Ultra Base 2017
Harley Davidson FLHTCUTG Tri Glide Ultra Base 2018
Harley Davidson FLHTCUTG Tri Glide Ultra Base 2019
Harley Davidson FLHTCUTG Tri Glide Ultra Base 2020
Harley Davidson FLHTCUTG Tri Glide Ultra Base 2021
Harley Davidson FLHTCUTGSE CVO Tri Glide Base 2020
Harley Davidson FLHTCUTGSE CVO Tri Glide Base 2021
Harley Davidson FLHTKSE CVO Limited Base 2017
Harley Davidson FLHTKSE CVO Limited Base 2018
Harley Davidson FLHTKSE CVO Limited Base 2019
Harley Davidson FLHTKSE CVO Limited Base 2020
Harley Davidson FLHTKSE CVO Limited Base 2021
Harley Davidson FLHX Street Glide Base 2017
Harley Davidson FLHX Street Glide Base 2018
Harley Davidson FLHX Street Glide Base 2019
Harley Davidson FLHX Street Glide Base 2020
Harley Davidson FLHX Street Glide Base 2021
Harley Davidson FLHXS Street Glide Special Base 2017
Harley Davidson FLHXS Street Glide Special Base 2018
Harley Davidson FLHXS Street Glide Special Base 2019
Harley Davidson FLHXS Street Glide Special Base 2020
Harley Davidson FLHXS Street Glide Special Base 2021
Harley Davidson FLHXSE CVO Street Glide Base 2017
Harley Davidson FLHXSE CVO Street Glide Base 2018
Harley Davidson FLHXSE CVO Street Glide Base 2019
Harley Davidson FLHXSE CVO Street Glide Base 2020
Harley Davidson FLHXSE CVO Street Glide Base 2021
Harley Davidson FLRT Freewheeler Base 2017
Harley Davidson FLRT Freewheeler Base 2018
Harley Davidson FLRT Freewheeler Base 2019
Harley Davidson FLRT Freewheeler Base 2020
Harley Davidson FLRT Freewheeler Base 2021
Harley Davidson FLSB Sport Glide 107 Base 2018
Harley Davidson FLSB Sport Glide 107 Base 2019
Harley Davidson FLSB Sport Glide 107 Base 2020
Harley Davidson FLSB Sport Glide 107 Base 2021
Harley Davidson FLSL Softail Slim 107 Base 2018
Harley Davidson FLSL Softail Slim 107 Base 2019
Harley Davidson FLSL Softail Slim 107 Base 2020
Harley Davidson FLSL Softail Slim 107 Base 2021
Harley Davidson FLSTC Heritage Softail Classic Base 2017
Harley Davidson FLTRK Road Glide Limited Base 2020
Harley Davidson FLTRK Road Glide Limited Base 2021
Harley Davidson FLTRU Road Glide Ultra Base 2017
Harley Davidson FLTRU Road Glide Ultra Base 2018
Harley Davidson FLTRU Road Glide Ultra Base 2019
Harley Davidson FLTRX Road Glide Base 2017
Harley Davidson FLTRX Road Glide Base 2018
Harley Davidson FLTRX Road Glide Base 2019
Harley Davidson FLTRX Road Glide Base 2020
Harley Davidson FLTRX Road Glide Base 2021
Harley Davidson FLTRXS Road Glide Special Base 2017
Harley Davidson FLTRXS Road Glide Special Base 2018
Harley Davidson FLTRXS Road Glide Special Base 2019
Harley Davidson FLTRXS Road Glide Special Base 2020
Harley Davidson FLTRXS Road Glide Special Base 2021
Harley Davidson FLTRXSE CVO Road Glide Base 2018
Harley Davidson FLTRXSE CVO Road Glide Base 2019
Harley Davidson FLTRXSE CVO Road Glide Base 2020
Harley Davidson FLTRXSE CVO Road Glide Base 2021
Harley Davidson FXBB Street Bob 107 Base 2018
Harley Davidson FXBB Street Bob 107 Base 2019
Harley Davidson FXBB Street Bob 107 Base 2020
Harley Davidson FXBBS Street Bob 114 Base 2021
Harley Davidson FXBR Breakout 107 Base 2018
Harley Davidson FXBR Breakout 107 Base 2019
Harley Davidson FXBRS Breakout 114 Base 2018
Harley Davidson FXBRS Breakout 114 Base 2019
Harley Davidson FXBRS Breakout 114 Base 2020
Harley Davidson FXDRS FXDR 114 Base 2019
Harley Davidson FXDRS FXDR 114 Base 2020
Harley Davidson FXFB Fat Bob 107 Base 2018
Harley Davidson FXFB Fat Bob 107 Base 2019
Harley Davidson FXFBS Fat Bob 114 Base 2018
Harley Davidson FXFBS Fat Bob 114 Base 2019
Harley Davidson FXFBS Fat Bob 114 Base 2020
Harley Davidson FXFBS Fat Bob 114 Base 2021
Harley Davidson FXLR Low Rider 107 Base 2018
Harley Davidson FXLR Low Rider 107 Base 2019
Harley Davidson FXLR Low Rider 107 Base 2020
Harley Davidson FXLRS Low Rider S 114 Base 2020
Harley Davidson FXLRS Low Rider S 114 Base 2021
Harley Davidson FXST Softail Standard 107 Base 2020
Harley Davidson FXST Softail Standard 107 Base 2021
Harley-Davidson FLFB Fat Boy 107 Base 2020
Harley-Davidson FLFB Fat Boy 117 Base 2025
Harley-Davidson FLFB Fat Boy 117 Base 2026
Harley-Davidson FLFBS Fat Boy 114 Base 2022
Harley-Davidson FLFBS Fat Boy 114 Base 2023
Harley-Davidson FLHC Heritage Classic 117 Base 2026
Harley-Davidson FLHCS Heritage Classic 114 Base 2022
Harley-Davidson FLHCS Heritage Classic 114 Base 2023
Harley-Davidson FLHCS Heritage Classic 114 Base 2024
Harley-Davidson FLHFB Electra Glide Highway King Base 2023
Harley-Davidson FLHR Road King Base 2022
Harley-Davidson FLHRC Road King Classic Base 2017
Harley-Davidson FLHRC Road King Classic Base 2018
Harley-Davidson FLHRC Road King Classic Base 2019
Harley-Davidson FLHRXS Road King Special Base 2022
Harley-Davidson FLHRXS Road King Special Base 2023
Harley-Davidson FLHRXS Road King Special Base 2024
Harley-Davidson FLHRXS Road King Special Base 2025
Harley-Davidson FLHT Electra Glide Standard Base 2022
Harley-Davidson FLHTCUTG Tri Glide Ultra Base 2022
Harley-Davidson FLHTCUTG Tri Glide Ultra Base 2023
Harley-Davidson FLHTCUTG Tri Glide Ultra Base 2024
Harley-Davidson FLHTCUTG Tri Glide Ultra Base 2025
Harley-Davidson FLHTCUTG Tri Glide Ultra G.I. Base 2022
Harley-Davidson FLHTCUTGSE CVO Tri Glide Base 2022
Harley-Davidson FLHX Street Glide Base 2022
Harley-Davidson FLHX Street Glide Base 2023
Harley-Davidson FLHX Street Glide Base 2024
Harley-Davidson FLHX Street Glide Base 2025
Harley-Davidson FLHX Street Glide Base 2026
Harley-Davidson FLHXS Street Glide Special Base 2022
Harley-Davidson FLHXS Street Glide Special Base 2023
Harley-Davidson FLHXSE CVO Street Glide Base 2022
Harley-Davidson FLHXSE CVO Street Glide Base 2023
Harley-Davidson FLHXSE CVO Street Glide Base 2024
Harley-Davidson FLHXSE CVO Street Glide Base 2025
Harley-Davidson FLHXSE CVO Street Glide Base 2026
Harley-Davidson FLHXST Street Glide ST Base 2022
Harley-Davidson FLHXST Street Glide ST Base 2023
Harley-Davidson FLHXU Street Glide Ultra Base 2025
Harley-Davidson FLI Hydra-Glide Revival Base 2024
Harley-Davidson FLRT Freewheeler Base 2022
Harley-Davidson FLRT Freewheeler Base 2023
Harley-Davidson FLRT Freewheeler Base 2024
Harley-Davidson FLRT Freewheeler Base 2025
Harley-Davidson FLSB Sport Glide 107 Base 2022
Harley-Davidson FLSB Sport Glide 107 Base 2023
Harley-Davidson FLSB Sport Glide 107 Base 2024
Harley-Davidson FLSTFI Fat Boy Gray Ghost Base 2025
Harley-Davidson FLTRK Road Glide Limited Base 2022
Harley-Davidson FLTRK Road Glide Limited Base 2023
Harley-Davidson FLTRK Road Glide Limited Base 2024
Harley-Davidson FLTRKSE CVO Road Glide Limited Base 2022
Harley-Davidson FLTRT Road Glide 3 Base 2024
Harley-Davidson FLTRT Road Glide 3 Base 2025
Harley-Davidson FLTRT Road Glide 3 Base 2026
Harley-Davidson FLTRX Road Glide Base 2022
Harley-Davidson FLTRX Road Glide Base 2023
Harley-Davidson FLTRX Road Glide Base 2024
Harley-Davidson FLTRX Road Glide Base 2025
Harley-Davidson FLTRX Road Glide Base 2026
Harley-Davidson FLTRXRRSE CVO Road Glide RR Base 2025
Harley-Davidson FLTRXS Road Glide Special Base 2022
Harley-Davidson FLTRXS Road Glide Special Base 2023
Harley-Davidson FLTRXSE CVO Road Glide Base 2022
Harley-Davidson FLTRXSE CVO Road Glide Base 2023
Harley-Davidson FLTRXSE CVO Road Glide Base 2024
Harley-Davidson FLTRXSE CVO Road Glide Base 2025
Harley-Davidson FLTRXST Road Glide ST Base 2022
Harley-Davidson FLTRXST Road Glide ST Base 2023
Harley-Davidson FLTRXSTSE CVO Road Glide ST Base 2025
Harley-Davidson FLTRXSTSE CVO Road Glide ST Base 2026
Harley-Davidson FXBB Street Bob 117 Base 2025
Harley-Davidson FXBB Street Bob 117 Base 2026
Harley-Davidson FXBBS Street Bob 114 Base 2022
Harley-Davidson FXBBS Street Bob 114 Base 2023
Harley-Davidson FXBBS Street Bob 114 Base 2024
Harley-Davidson FXBR Breakout 117 Base 2024
Harley-Davidson FXBR Breakout 117 Base 2025
Harley-Davidson FXBR Breakout 117 Base 2026
Harley-Davidson FXFB Fat Bob 107 Base 2020
Harley-Davidson FXFBS Fat Bob 114 Base 2022
Harley-Davidson FXFBS Fat Bob 114 Base 2023
Harley-Davidson FXLRS Low Rider S 117 Base 2022
Harley-Davidson FXLRS Low Rider S 117 Base 2023
Harley-Davidson FXLRS Low Rider S 117 Base 2024
Harley-Davidson FXLRS Low Rider S 117 Base 2025
Harley-Davidson FXLRS Low Rider S 117 Base 2026
Harley-Davidson FXLRST Low Rider ST 117 Base 2022
Harley-Davidson FXLRST Low Rider ST 117 Base 2023
Harley-Davidson FXLRST Low Rider ST 117 Base 2024
Harley-Davidson FXLRST Low Rider ST 117 Base 2025
Harley-Davidson FXLRST Low Rider ST 117 Base 2026
Harley-Davidson FXRST Low Rider El Diablo 117 Base 2022
Harley-Davidson FXST Softail Standard 107 Base 2022
Harley-Davidson FXST Softail Standard 107 Base 2023
Harley-Davidson FXST Softail Standard 107 Base 2024