Introducing the GP Suspension 20mm Cartridge Kit

Years in the Making, Now Ready for Your Harley

After extensive development and testing, we're proud to release our new 20mm cartridge kit—engineered to deliver the same premium performance as our legendary 25mm system, now for smaller diameter forks.

Manufactured & Built in Ventura County, USA. We maintain complete control over quality and componentry because we never compromise on what matters most: your ride.

Racetrack-Proven Technology, Street-Tuned Perfection

This isn't a budget alternative—it's a high-performance hydraulic system that delivers the same flawless operation our 25mm cartridges proved on the racetrack. We wanted riders with smaller forks to experience the best internal replacement system available, so we spared no expense.

Every kit is custom-built after you order. We know that proper setup is just as crucial as premium components. Whether you're touring cross-country over changing terrain or railing canyons at speed, we dial in your suspension for your specific riding style.

Fully Adjustable, Infinitely Tuneable

• 30 clicks of compression adjustment
• 30 clicks of rebound adjustment
• 12 turns of preload

Set it and forget it, or fine-tune to your heart's content—we guarantee we'll find your perfect setup.

Stock Length Harley Fitment (1987-2005)

Compatible Models: FXR, FXLR, Dyna, and XL series

Specifications:

• Stock length application
• Designed for 24.25" chrome tubes

Keep your original stance while transforming your ride quality.

See installation video:

https://www.youtube.com/watch?v=qQg5CtwgOE4

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