The diameter allowance was instituted because it was felt that performance benefits gained by increasing wheel diameters were highly debateable, and minimal in scope in the best cases. Lot's of balancing tradeoffs are involved there.
Width, however, is another story.
So, my answer to your question of implications is my bulleted points above;
http://72.167.111.130/forums/showpos...6&postcount=70
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