Progressive Suspension Monotube Fork Cartridge/Spring Kits for '18-25 Harley Davidson Softail Models (See Fitments Below)
Fork Monotube Kit M8 Softail w/ FST & Ext. Preload Adjust
True high performance front suspension is finally available for the 2017+ M8 Softail line with 49mm front ends. Yes again, we’ve gone back to the drawing board and created a state-of-the-art Fork Cartridge Kit designed to outperform everything on the market. The asymmetrical design places a preload adjuster over a progressive rate spring combined with our road smoothing Frequency Sensing Technology (FST) damper to create a state-of-the-art fork cartridge kit for Milwaukee Eight Softail models.
The result is superior damping and ride control combined with tunable preload and a new benchmark for high performance suspension on the 49mm M8 Softail platforms.
- Features road-smoothing Frequency Sensing Technology (FST) damper for improved resistance to front brake dive, front-end stability and corner.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Fitments
| 2025 | Harley-Davidson | Softail Fat Boy FLFB |
| 2025 | Harley-Davidson | Softail Heritage Classic FLHC |
| 2025 | Harley-Davidson | Softail Breakout FXBR |
| 2024 | Harley-Davidson | FLI Hydra-Glide Revival |
| 2023-2024 | Harley-Davidson | FXBR Breakout 117 |
| 2022 , 2025 | Harley-Davidson | Softail Street Bob FXBB |
| 2021 , 2023-2024 | Harley-Davidson | FXBBS Street Bob 114 |
| 2020-2024 | Harley-Davidson | FXST Softail Standard 107 |
| 2018-2024 | Harley-Davidson | FLFBS Fat Boy 114 |
| 2018-2024 | Harley-Davidson | FLHCS Heritage Classic 114 |
| 2018-2021 | Harley-Davidson | FLHC Heritage Classic 107 |
| 2018-2021 | Harley-Davidson | FLSL Softail Slim 107 |
| 2018-2020 | Harley-Davidson | FXBB Street Bob 107 |
| 2018-2020 | Harley-Davidson | FLDE Deluxe 107 |
| 2018-2020 | Harley-Davidson | FXLR Low Rider 107 |
| 2018-2020 | Harley-Davidson | FXBRS Breakout 114 |
| 2018-2019 | Harley-Davidson | FXBR Breakout 107 |
| 2018-2019 | Harley-Davidson | FLFB Fat Boy 107 |
























