Zerostack headset fit I am looking to get a ZeroStack headset upper and have found the right size in terms of diameters.  However, different models of headset reach different depths into the cup on the frame.  Should the headset depth fit the cup perfectly?  Is it acceptable for the headset to not reach the bottom of the cup? 



The frame is an Orange Elite 2012. The depth is approximately 12mm.
That is a semi integrated head tube to be used with semi integrated head set, a fully integrated head tubes machining is different , it would have a precis depth and an 45 degree angle to it , in order to match fully integrated bearings and yield a exact final bearing depth . When useing a semi integrated system the cup or race you press into the head tube takes the place of this precision machining of the head tube.