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2.1mm?! I’m not building a snow plow.
But yeah, headtube is just one thing needed. I also need small dia tubing and something for a steerer. I’ll maybe look to Ceeway for the head tube
PhilDAS-
Yeah there’s probably something there that’d work in a thinner wall just that was the closest id.
You could probably go with a smaller id as reamers are readily available but then again, using a reamer designed for bicycles ain’t gonna fly on a super long headtube. Maybe you’ll need to come up with some sort of guide bushing to keep the tool centred? There must be a way.
M_V
The 0.083” wall thickness 1 ½” od is probably the closest, but will be too heavyweight I’d have thought.
It’s also £8.55 a foot without vat. I just bought 650mm of headtube from Ceeway for £12.98 plus vat.
But if you do go the 4130 route, I’ve been using LAS too, service is always pretty good.