Canyon Aero Extension SpacerAluminum spacers to increase the stack of the Canyon Gear Groove Aero Extension by up to 40 mm. The spacers are 10 mm in height and come in packs of up to 4 pieces, as well as different sized screws to ensure sufficient thread engagement depending on how many spacers are in play. *Note that the spacers are only compatible with Canyon's Aero Extension. The spacers are not compatible with our Gear Groove Aerobar Adapter.