The FSA Headset No.42 is a replacement headset for certain Specialized mountain bikes and electric mountain bikes. Includes: top cover, washer, compression ring, upper bearing (1-1/8"), lower bearing (1.5"), and crown race. Specifications: Part: No.42/ACB/S/F/N Material: Aluminum Upper Bearing: TH MR121 1-1/8 45degx45deg K9 Lower Bearing: TH MR170 1.5 45degx45 J9 Weight: 2.5 oz It is compatible with the following bikes: Specialized Camber Fsr Specialized Camber Fsr Men Specialized Camber Fsr Wmn Specialized Enduro Specialized Enduro Fsr Specialized Epic Fsr Specialized Epic Ht Specialized Fatboy Specialized Fuse Specialized Kenevo Specialized Kenevo Fsr Specialized Levo Specialized Levo Fsr Specialized Levo Fsr Men Specialized Levo Fsr Wmn Specialized Levo Ht Specialized Levo Ht Fat Specialized Levo Ht Men Specialized Levo Ht Wmn Specialized Levo Men Specialized Levo Wmn Specialized Rhyme Fsr Specialized Rumor Fsr Specialized Sj Specialized Sj Fsr Specialized Sj Fsr Men Specialized Sj Fsr St Men Specialized Sj Fsr St Wmn Specialized Sj Fsr Wmn Specialized Sj Ht Specialized Sj St