Get a Chris King Steelset and be done with it. Most places, Jenson, Pricepoint, Go-ride sell them for around 135. Had to buy one when I ovalized my head tube and they work. Think of them as a second head tube...
No guys im not building a bike Its just i have this thing its like a cross between a mini bike and a dirt bike but it uses dh forks so i need a new head tube for it.
You can buy precut headtubes for road bikes but they are way too thin for anything aggressive. What you want is some straight gauge 4130 tubing. Wicks Aircraft or Aircraft Spruce can sell you what you need.
1.5 x .083 is really the only size that works. It leaves you just a little bit of material to ream out after the frame is done. If your headtube needs to be thicker, you'll need to braze on some reinforcing rings.
Why don't you quote the whole post. It clearly states that he is looking for a HEADTUBE in order to modify a frame. Sounds like he's trying to put a shiver on a 50 or something similiar.
And you can remove headtubes and replace them with one of a different size if you know what you're doing. I've done this to a few old 1" frames including a Merlin.
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