The Aethos uses a conventional headset with one part for all frame sizes (S202500012). The headset includes a new lightweight top cap (S202500013) and compression plug (S202500011).
The torque spec for the new compression plug is lower than the standard version–please use a torque wrench when installing it. A maximum of 35mm of spacers may be placed beneath the stem. The lightweight scalloped spacers may be used below the stem only. A maximum of 5mm of solid spacers may be installed above the stem.