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@Regal
Is the headtube length on old and new bikes exactly the same? Also, if it's a different headset then the stack heights could vary and require a different steerer length. I would build the new bike up with a fair allowance of extra steerer; measure the bar position; ride it for a bit to make sure it's right; and only then cut the steerer, by marking around the top of the stem (and then adding a mm or so to allow for a small spacer sitting on top of the stem).