FSA Impact Pro IS42 headset

The Impact Pro headset features integrated sealed cartridge bearings that fit directly into the head tube of any frame using 42mm 45°/ 45° bearings. Examples: pre-2015 Cinelli Vigorelli, MASH Histogram & MASH Bolt, Breakbrake17 Transfer, pre-2020 Affinity Kissena. Specifications • 1 1/8" integrated • 45°/ 45° IS42 angular contact bearings (Campy compatible) • alloy top cap/steel star nut assembly • 7075 AL crown race • stack height: 9.4mm • weight: 64g