This assembly is used to change the travel in the 2023+ C1 models of RockShox Lyrik without having to buy the entire air shaft assembly. This is NOT backwards compatible with previous generations of RockShox Pike. Changes the travel of your 2023+ C1 RockShox Pike without replacing the entire Debonair+ air shaft assembly Includes new o-ring for reassembly of ButterCups REQUIRES 10mm Shaft Clamp for the disassembly of your current shaft and reassembly with the new shaft