A lot of head tubes are turned on a lathe with the ends left thicker to resist the insertion pressure of the headset cups, but I'm using plain tubing, so the rings are a good addition.
They have the added benefit of helping the look of the transition from the headset cup to the frame, and as I'm using stainless ones any exposed metal left when you face the head tube post-painting should make it more corrosion resistant.
A lot of head tubes are turned on a lathe with the ends left thicker to resist the insertion pressure of the headset cups, but I'm using plain tubing, so the rings are a good addition.
They have the added benefit of helping the look of the transition from the headset cup to the frame, and as I'm using stainless ones any exposed metal left when you face the head tube post-painting should make it more corrosion resistant.