I finally saw one of the STI hubs and it is stepped. Inner step is 58mm for the rotor and outer is 56mm for the wheel. I just machined my hub down to 58mm and machined a small releif on the ouside diameter to clear the step on the inside of the rotor. I then bought. 73mm x 56mm aluminium hub centric rings for the rear wheels and opened up the ID to 58mm to fit the new hub. Now I can buy new rotors and not have to make any adjustments.
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