This is the Fhb My12 Axis Freehub For Models 1.0 & 2.0 (Fh-04)This is compatible with the following bikes: Specialized Alias Specialized Allez Specialized Amira Specialized Ariel Specialized Ariel Deluxe Specialized Ariel Intl Specialized Bg Roulux Specialized Camber Fsr Specialized Carmel Specialized Carmel 700 Specialized Carmel 700 Low Entry Specialized Carmel Low Entry Specialized Crossroads Specialized Crossroads Low Entry Specialized Crosstrail Specialized Crosstrail Deluxe Specialized Crux Specialized Dolce Specialized Expedition Specialized Expedition Low Entry Specialized Hardrock Specialized Hardrock Intl Specialized Haul Specialized Haul Step Through Specialized Jett Specialized Myka Ht Specialized Myka Ht Intl Specialized Rockhopper Specialized Rockhopper Intl Specialized Roll Specialized Roubaix Specialized Ruby Specialized Secteur Specialized Shiv Specialized Sirrus Specialized Tarmac Specialized Transition Specialized Tricross Specialized Venge Specialized Vienna Specialized Vienna Deluxe Specialized Vienna Deluxe Step Through Specialized Vienna Step Through Specialized Vita