• mine seems to stack up at around 35mm

    That's typical.

    seems like i need about 205-210mm of steerer? (175mm headtube)

    Aim for 210, but 205 is workable if you're prepared to factor in the cost of that low stack headset. You can go a little bit longer by inserting a spacer between the top cup and lock nut, but not too much or you might run out of thread.

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