The K-Tech Tracker front fork cartridges are a complete replacement damping system designed to fit into original equipment front forks that do not have external adjustment as standard. The Tracker cartridges are designed and manufactured in house to the same standard as all our performance products using the highest grade materials and processes. Refinement, control, stability and style comes as standard with the K-Tech Tracker front fork cartridges that are aimed at the custom/classic motorcycle owner. The Tracker cartridges come with external adjustment for spring preload, compression and rebound damping allowing the rider to adjust the forks for all types of riding styles and conditions. Std OEM Spring Rate= 9.0N this cartridge uses springs # 35-340-