The IRT (Infinite Rate Tune) kit for Manitou Mattoc Expert/Pro makes it possible to further improve Mattoc sensitivity while ensuring excellent mid-stroke hold and preserving perfect end-of-stroke behavior. The IRT kit for Manitou Mattoc Expert/Pro is designed for riders who have a good understanding of how air springs work and want to customize their behavior to obtain a Mattoc that offers even greater sensitivity at the start of the race AND more mid-stroke hold. The IRT Mattoc Expert/Pro kit is compatible with all Mattoc versions except Mattoc Comp and is also compatible with Manitou Mastodon Pro forks from model year 2018 (production date from end 2017 - thread 31 x 0.8 mm).