Paul Boyd wrote:

*ALL* headsets use bearings, AFAIK.

"Rob Morley" a écrit:

Some small-wheelers have a ball race at the bottom and a nylon
bush at the top.

Raleigh Twenties being a common example. Of course it's still a bearing,
just not a ball bearing.

There was a plastic headset in the early eighties that used, IIRC, Delrin
cups and PTFE bushes top and bottom. I don't recall the brand, but they
didn't stay long on the market.

James Thomson