GP Suspension, 25mm Cartridge Kit for Harley Davidson Dyna FXDL, FXDB, FXDLS 06' - 16'

GP Suspension’s 25mm Cartridge Kit—trusted by national-level racers—is now tuned specifically for Harley-Davidson Dyna models. The valving, spring rate, and travel have been optimized to transform your front end into a performance suspension system built for precision, comfort, and confidence.

American Made, Race-Tested

Every kit is engineered, machined, and assembled in-house at GP Suspension’s Ventura, CA facility. GP Suspension does not outsource machining or engineering—everything is done in the USA. The result? Maximum traction, improved comfort, and a ride that puts a smile on your face—whether you're carving canyons or cruising rough pavement.

Custom-Built for You

GP Suspension builds every kit to suit the rider’s weight and riding style. A spring set is selected by a GP Suspension setup technician based on the riding information you provide. Whether you're seeking a buttery-smooth ride on rough streets or precision handling for aggressive riding or track days, GP Suspension delivers.

Key Features:

Fully adjustable preload, compression, and rebound (adjustments located on fork caps). Increased stroke: from 122mm to 126mm for enhanced compliance and feel. Custom lengths available for riders seeking additional ground clearance or altered geometry (customer must supply longer chrome tubes). Designed, machined, and assembled entirely in Ventura, CA—100% American made

** Installation Notes:

***** Slight modification of upper fork tubes required *****

Removal of OEM bottoming assembly necessary due to the larger diameter piston

Watch installation video here