Scepter 25 Cartridge Kit - 49mm STD Weight M8 Softail Models — Harley-Davidson (2018-2025)

Scepter 25 cartridge kit for 49mm standard-weight M8 Softail models, featuring a 25mm CNC 7075-T6 damping piston and nitrogen-charged IFP design for stable, consistent dampening out of the box. Pre-tuned geometry eliminates the need for post-installation adjustments while delivering feedback-rich suspension feel without sacrificing comfort.

Features

• 25mm CNC 7075-T6 damping piston for stable damping quality
• Cr-Si steel spring with consistent rate and fatigue resistance
• Preload, compression, and rebound adjustable cartridges
• Nitrogen-charged oil/gas separation system for continuous dampening
• 24-click rebound adjuster
• 24-click compression adjuster
• 15mm preload adjustability on both sides
• Multiple spring rate options available

Specifications

• Brand: Harddrive
• Manufacturer Part #: R0900109-1
• UPC: 191361512148
• Cartridge Size: 49mm STD Weight
• Length: 35.4 in
• Width: 5.9 in
• Height: 3.9 in
• Weight: 6.7 lbs
• Country of Origin: China (Taiwan)

Fitment

Fits M8 Softail bagger models. Unlike cartridges for Dyna and FXR models, these have no access to adjusters once installed — all tuning is completed at the factory.

Frequently Asked Questions

Can I adjust the cartridges after installation?

No — the cartridges are sealed and non-adjustable once installed. They arrive pre-tuned from the factory with no post-install adjustment needed.

Do these require longer fork tubes?

These are standard-weight cartridges and do not require longer fork tubes beyond stock M8 Softail dimensions.

What adjustments are available?

24-click rebound, 24-click compression, and 15mm preload adjustability on both sides — all tuning is done before final installation.

Can I choose different spring rates?

Yes — multiple spring rate options are available. Confirm your desired rate when ordering.

How does the nitrogen system work?

The nitrogen-charged oil/gas separation system maintains consistent damping pressure throughout the suspension stroke for continuous performance.