Hope integral semi integrated zs44 headsetthis is the most common of the integratedinternal headsets using the 3645 deg bearing size this is the one youre usually going to see in mtb frames super low 11mm stack height only available in black featuresfull stainless steel bearings replacable split crown race common parts throughout the range all parts available as spares and fully rebuildable total stack height 11mmbuy hope components from chain reaction cycles the worlds largest onli