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Join Date: Oct 2004
Location: DC / Maryland suburbs
Posts: 4,166
Bikes: Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
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There was a recent thread on here in which someone asked a similar question about putting headset cups into a headtube that was 0.2 mm too small. You might want to search for it...
I believe a well-equipped LBS could probably machine your head tube to accomodate the 30.2mm cups, if they don't fit. This would almost certainly be possible with a steel head tube, I'm less certain if it would be safe with a thin-walled aluminum head tube.