Rockshox yari rc solo air forks boostyari is a fork developed for those who know no boundaries no matter what the terrain yari can deal with whatever you throw at it with the same confidence inspiring strength and stiffness of lyrik yari has the versatility of a trail fork with lower travel options solo air allows you to add air to your forks through a single schrader valve filling both the positive and negative air spring chambers simultaneously solo air delivers a plush predictable