Specialized Aethos 2 Stem Spacer & Transition Kit for Alpinist Stem Description: The Specialized Aethos 2 Stem Spacer & Transition Kit for Alpinist Stem includes headset and stem transitions cover pieces for Specialized Aethos 2 Bikes when paired with Roval Alpinist stem or other threadless aftermarket stems. Features: Genuine Specialized replacement parts Kit consists of transition headset spacers for Roval Alpinist stems Also includes spacers meant to fit aftermarket stems Includes: (1) 9.2mm Lower headset transition top cover, adapts Aethos 2 frame to aero spacers (3) 10mm Aethos 2 aero plastic headset spacer (1) 5mm Aethos 2 aero plastic headset spacer (1) Upper stem transition spacer, adapt Aethos 2 aero spacer to the Roval Alpinist stem (1) Upper universal stem transition spacer to adapt Aethos 2 aero spacer to aftermarket stems Specifications: Color: Black