changing post height is not the same as changing crank length as far as I know
And no-one suggested it was: if you change the length of your crank, you will need to adjust the height of your seatpost.
I was referring to amey posts, he is simulating crank length changes moving the post, but I might have misunderstood
@debo started
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And no-one suggested it was: if you change the length of your crank, you will need to adjust the height of your seatpost.