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Normally if you add 20mm to the fork length, is slackens everything off by 1 degree.
Now if you slacken the headangle by 1 degree using an angleset, would that actually steepen the seatube by 1 degree?
Yes. If you want to slacken the head angle but keep the seat angle the same you need to either adjust the fork length or use offset bushes (or both) as well.
I don't think it will - it'll steepen the ST [b]slightly[/b], due to the fact that as the head angle is slacker the front of the bike will be a bit lower (and the wheelbase a bit longer).
It will slacken the SA by a bit but its not noticable. However offset bushings are very noticeable on the SA.
adjust saddle.
What question do you think your answering there iffoverload?
fair point, no, change will be less than HA.