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I've always wondered why headsets don't use bushings rather than bearings. An Igus bushing would be fine for that purpose
Too much friction in the lower bearing, which has a lot of axial thrust on it. You can ride with a lot of friction (see friction steering "dampers" on some old BMW motorcycles), but it's not fun as you end up thrupenny bitting every curve.
gbj_tester
Even in stainless, 0.75mm is bloody thin for something you'll be trying to press fit into the headtube. And 0.05mm is what I'd consider a loose sliding fit rather than a clearance tolerance. The only way I can see it working well is to make the headset cups totally external and then either bond, braze or weld them to the outside of the headtube. With your design I'd classify the headset cups more as bushings than bearing retainers. Mind you, I've always wondered why headsets don't use bushings rather than bearings. An Igus bushing would be fine for that purpose I'd have thought.