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Would this crown race maybe work? What's the ID of the headtube?
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Possibly, unless the 45deg bevel starts too far out. I assume the outer diameter is too large, but it should't be an issue to file the edges down a bit.
I actually spotted that one too -- after placing an order at cnc and receiving the headset. At that price I would have given it a go, but cnc shipping costs are pretty steep. I guess I should check out lbs's but that tends to be low-yield with anything even slightly uncommon.
The headtube internal diameter is 37mm, and steerer at fork crown 33mm.
Won't work, I need 1 1/4" (EC37/33) external lower cup. Which I have except for the crown race.