Fox Factory Fork Cartridge Kit For Harley Touring Fox's cartridge and spring kits use linear rate springs that maintain the same support throughout the fork's travel and won't dive when you brake or wallow when you corner. The cartridge's opposed-piston design creates a sealed system to prevent air from mixing into the oil, resulting in consistent damping control no matter how long you ride. The cartridge's spring-loaded upper piston moves easily to absorb even the smallest bumps, unlike gas-charged designs that can create internal friction and a harsh ride. Features: Model-specific ride tune Works with existing forks to maintain original look Speed-sensitive closed cartridge damping control Tuned for improved rider comfort and cornering control Linear spring rates support the fork with consistent force, reducing brake dive Fully rebuildable and re-valvable