RockShox Damper Upgrade Kit - Charger 3.1 Headvalve / Shim Kit - Upgrades Existing Charger 3.0 Dampers to Charger 3.1 The Charger 3.1 RC2 Piston Kit upgrades existing Charger 3 dampers to the NEW Charger 3.1. With increased damping range, Charger 3.1 RC2 is primed to take on any trail. Less compression damping in the Low Speed Compression open position and additional support in the High Speed Compression closed position gives you the traction, control, and comfort you need to charge dicey lines all day. This can only be installed during a complete damper service. Upgrades existing Charger 3 RC2 dampers to Charger 3.1 Easily upgrade the damper while completing a 200-hour service Includes the piston assembly, IFP spring, tuning shim, and the Charger 3.1 High Flow Piston Tool Compatible with Pike C1+(2023+), Lyrik D1+(2023+), ZEB A1+(2021+), and Boxxer D1+(2024+) Charger 3 RC2 dampers High Speed Compression, Low Speed Compression, and Low Speed Rebound adjustments