Specialized Future Shock 3.0 Main Spring Kit Description: This Specialized Future Shock 3.0 Main Spring Kit is meant to customize or restore main springs found within select versions of the Specialized Future Shock. Features: Genuine Specialized replacement parts Main Spring Kit for Future Shock 3.0 suspension fork cartridges Kit includes all three versions of the spring Included Springs: Soft Spring: Blue (2.3 kg-mm. / 129 in-lbs.) Medium Spring: Blue (2.6 kg-mm. / 146 in-lbs.) Firm Spring: Yellow (2.9 kg-mm. / 162 in-lbs.)