Cane Creek 40-Series Conversion Crown Compatible with any modern Cane Creek headsets, this crown race allows you to run a 1-1/8" steerer in an oversized 1-1/2" bottom headset cup. Cane Creek engineered the 40-Series with optimal materials to construct the most effective internals and best aesthetics available in a headset, even down to this simple conversion crown. Features Compatible across 10, 40 and 110 Series headsets Backwards compatible with S and XX Series Integral molded seal | Cane Creek | 40-Series Conversion Crown Conversion Crown Race 1. 5" To 1-1/8"