Many of you probably aren’t even old enough to remember the original headsets that we had to deal with, and if that’s the case you should count your blessings. All headsets used to be based around a threaded steerer tube on your forks, and a ‘quill’ stem. The headset itself was basically two big threaded nuts, one of which was meant to act as the lock-ring in order to stop the whole thing coming loose. I say meant because they constantly came loose, even the ones that supposedly had some ingenious feature that was meant to cure the problem.
Basically everything about the design was rubbish, but somewhat incredibly when Dia Compe first introduced their revolutionary threadless ‘Aheadset’ it wasn’t universally accepted overnight. I suppose it boiled down to the fact that you needed a different fork steerer and stem, plus it almost seemed to0 simple and good to be true. Thankfully though it didn’t take too long for everyone to see just how great the system was, and now, many years on we don’t even bother with the ‘A’ part of the name, we just call this design a headset.