GP Suspension 25mm Cartridge Kit

For 47mm Showa Inverted Forks (CVO Models)

Your CVO Deserves Better Than Stock

You invested in a premium CVO for the ultimate Harley experience, but the stock inverted forks still leave performance on the table. While they look impressive and offer some improvement over standard forks, the reality is they lack the control and adjustability that your bike deserves.

Racetrack Innovation, Street Perfection

Our CVO cartridge kit brings proven racetrack technology to the road—engineered to absorb every bump while delivering exceptional confidence and traction. This isn't an overly stiff race system; it's precision-tuned for optimal street performance, blending race-proven innovation with road-ready comfort.

Manufactured & Built entirely in Ventura, CA. We've never outsourced our machining or engineering—every component is wholly American-made.

What Sets Us Apart

Three-Valve Technology

Our advanced three-valve system delivers superior fluid control and pressure management compared to conventional two-valve designs.

The advantage: The base valve, working alongside rebound and compression valves, provides precise hydraulic flow modulation. This eliminates fluid cavitation and pressure spikes that cause harsh, inconsistent damping in lesser systems.

Real-world performance: Soft response during low-speed compression for comfort, ramping up effectively for heavy impacts like potholes or speed bumps. Your suspension adapts intelligently, maintaining traction by keeping tires consistently connected to the road.

Topout Spring Control

Integrated Topout Spring Technology eliminates harsh fork extension at full travel while maintaining critical tire-to-ground contact. This prevents the jarring impact typically experienced when forks reach maximum extension and ensures your tire stays planted for maximum traction and control—essential for both safety and performance in all riding conditions.

Progressive Bottom-Out Control

Advanced Bump Stop Technology provides progressive bottom-out control that prevents harsh compression impacts. Rather than a sudden, jarring stop, our system progressively controls compression at the end of travel, maintaining traction and rider confidence even when suspension reaches its limits—critical for aggressive riding and unexpected road obstacles.

Custom-Built for You

Every kit is tailor-made considering your weight, bike weight, and riding preferences. Whether you want buttery smooth cruising on bumpy roads or rail-like precision for track day abuse, we build your kit specifically for your needs.

Full Adjustability at Your Fingertips

Located conveniently on your new fork cap:

• 12 Turns of Preload adjustment
• 30 Clicks of Compression 
• 30 Clicks of Rebound 

Set it and forget it, or fine-tune between rides—we're always a call away for setup support.

Performance & Length Options

• Increased stroke: 110mm to 122mm (regardless of length chosen)
• Three length options available:
  • Stock length (recommended with 12.8"-13.1" shocks)
  • 1" over (recommended with 12.8"-13.1" shocks)
  • 2" over (recommended with 13.5"-14" shocks)

Note: Pipe modification or short-style pipe required for shock lengths exceeding 13.1"

Transform your CVO's inverted fork performance with suspension that puts a smile on your face.

Pricing includes a spring set selected by our setup technician based on your riding information