Changes the travel of your RockShox ZEB fork without replacing the entire Debonair+ air shaft assembly Does not include Buttercup bottom stuff as that will need to be transferred over from your current air shaft if you have it. REQUIRES 10mm Shaft Clamp for the disassembly of your current shaft and reassembly with the new shaft (to swap bottom stud) INCLUDES bottom stud for non-Buttercup air springs Compatible with the following models of RockShox ZEB forks: ZEB-R-A1 ZEB-SEL-A1 ZEB-SEL-A2 ZEB-UFA-A3 ZEB-ULT-A1 ZEB-ULT-A2 ZEB-ULT-A3