Ritchey comp press fit zs 15 tapered headsetcomp level components are designed to bring competition worthy components down to a price that everyone can handle you wont find carbon here but you will find the kind of performance and reliability you expect from ritchey featuresheadset specs 11 3mm stack height upper sh is zs44286 lower sh is zs5540 upper headtube odid 5044mm lower headtube odid 6155mm a semi integrated press fit headsetcomp crmo top bearing coversemi cartridge