The Aheadsets are the original threadless headsets designed by the guys who became Cane Creek. They consider the Aheadset their 'value' line. The Aheadset supposedly comes with a plasic topcap while the Cane Creek stuff comes with a alloy one. Also the Aheadset (or at least the one I had at one point) used captured bearings (free rolling bearings in a little ring to keep them in place, probably the wrong name for it-best I could do at the time). The S-2 uses cartridge bearings (I have two bikes with these headsets). I prefer the cartridge bearings as they are easier to replace and to service.Kolo said:Can anyone tell me what is the difference between a Cane Creek C2 and S2 headset?