I reckon it will vary with the frame size, IIRC the small is more slopey on the top tube than the others. My advice would be to get a pitch meter and measure both the top tube and head angle on your chosen frame and then do some simple geometry.
@dna started
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I reckon it will vary with the frame size, IIRC the small is more slopey on the top tube than the others. My advice would be to get a pitch meter and measure both the top tube and head angle on your chosen frame and then do some simple geometry.