With the new DebonAir spring reducing friction, the forks respond more sensitively and smoothly than ever in RockShox history. It offers you maximum traction in all possible conditions and an optimally adjusted chamber volume. Create confidence and safety for even the most difficult descents. With the new, friction-reducing DebonAir air spring, the current forks and dampers respond more sensitively and smoothly than ever before in the history of RockShox. It offers you maximum traction under all conceivable conditions. An optimally adjusted chamber volume always leaves your fork high in the spring travel and creates trust and safety even for the most difficult descent. With this upgrade kit you can upgrade your Lyrik / Yari A1 + from the model year 2016 to the 2021 level of Rock Shox t.