Ritchey WSC Carbon UD Drop In Headset: Ritchey headsets are designed to take the abuse of bad roads & tough trails, while delivering smooth, reliable performance over the long haul. There headsets dont always get the attention they deserve; beautiful handlebars & stems can be so distracting. But this component is the interface between frame, fork & stem, & the basis for precision steering. Full complement stainless steel angular contact cartridge bearings packed with Ritchey high-webbing grease 18mm stack height Carbon fibre bearing cap A Drop in style headset Titanium coated high quality, long lasting bearings only featured in WCS Supplied with Ritchey compression device with carbon top cap! UD carbon finish 15mm height top cap (fully carbon) Top cover outer diameter is 46mm Fits headtubes measuring 1.1/8" Weight: 70g