S&S 4.5" M8 Stroke Flywheel w/Tapered Rods & Balancer Gear (320-0598)
- 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
- 4-1/2" Stroke (114 or 128ci)
- Balance Gear installed
- Heat Treated 4140 Material is harder & more than twice as strong as stock
- Stronger assembly eliminates need to weld crankpin
- Capable of higher RPM - More available power!
- S&S High Strength Connecting Rods are designed with Finite Element Analysis to eliminate weak spots and handle more power!
- Tapered wristpin connecting rods compatible with stock pistons
- Balanced for stock piston weight (1060g)
- Perfect for Gear Drive Cams
- Consistent balance & precision machining
- Made in the U.S.A.
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 2023 | Harley-Davidson | Breakout FXBR 117 | |
| 2018-2020 | Harley-Davidson | Breakout FXBRS 114 | |
| 2023 | Harley-Davidson | Electra Glide Highway King FLHFB | |
| 2021 | Harley-Davidson | Electra Glide Revival | |
| 2018-2023 | Harley-Davidson | Fat Bob FXFBS 114 | |
| 2018-2023 | Harley-Davidson | Fat Boy FLFBS 114 | |
| 2019-2020 | Harley-Davidson | FXDR FXDRS 114 | |
| 2018-2023 | Harley-Davidson | Heritage Classic FLHCS 114 | |
| 2022 | Harley-Davidson | Low Rider El Diablo | |
| 2020-2021 | Harley-Davidson | Low Rider S FXLRS 114 | |
| 2022-2023 | Harley-Davidson | Low Rider S FXLRS 117 | |
| 2022-2023 | Harley-Davidson | Low Rider ST FXLRST 117 | |
| 2020-2023 | Harley-Davidson | Road Glide Limited FLTRK | |
| 2019-2023 | Harley-Davidson | Road Glide Special FLTRXS | |
| 2022-2023 | Harley-Davidson | Road Glide ST FLTRXST | |
| 2019 | Harley-Davidson | Road Glide Ultra FLTRU | |
| 2019-2023 | Harley-Davidson | Road King Special FLHRXS | |
| 2021-2023 | Harley-Davidson | Street Bob FXBBS 114 | |
| 2019-2023 | Harley-Davidson | Street Glide Special FLHXS | |
| 2022-2023 | Harley-Davidson | Street Glide ST FLHXST | |
| 2023 | Harley-Davidson | Tri Glide Ultra Classic FLHTCUTG | |
| 2019-2022 | Harley-Davidson | Tri Glide Ultra FLHTCUTG | |
| 2022 | Harley-Davidson | Tri Glide Ultra FLHTCUTG G.I. Enthusiast Collectio | |
| 2019-2023 | Harley-Davidson | Ultra Limited FLHTK | |
| 2019 | Harley-Davidson | Ultra Limited Low FLHTKL | |