Odyssey Pro Conical Headset - Integrated, 1-1/8", 45 x 45, 12mm Stack, High PolishedThe Pro Conical headset features a taller conical shaped dust cap for a cleaner look with less spacers. High quality sealed bearings Color matched spacers included 12mm dust cap with 3mm and 2mm spacers Laser etched Odyssey bearings Campagnolo standard spec. 1 1 8 integrated headset 45deg tapered bearings 41. 8mm outer diameter (fits 42mm BMX head tubes) Product Specifics Upper Stack Height: 12 S. H. I. S. Stem Clamp Diameter: 28. 6 Threadless Defined