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If you know the BB drop, you could draw or plum line from the rear dropouts to the front axle fairly accurately. If you know the rake too then you should be able to draw a line through the headtube to the line that intersects the axles, add the rake and measure the axle to crown that way after accounting for headset stack.
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Can you make an educated guess at the seat angle and bb drop?
Should the frame have a horizontal top tube by any chance?
PhilDAS
M_V
@Tijs
What's the best way to figure out the right AC for a forkless frame with no geo chart available, given that you have decided on the rake?