I'm no expert, but I think the answer is yes: better geometry on the 7's, especiallly if you're following the common practice of putting 205s in front. The sixes came with 185s, which are appropriate to that rim size, in terms of sidewall flex, etc., but most people opt for 205s because they're commonly available, and they fit under the fenders.
I think the weight difference comes more from the larger tires than it does from the larger Fuchs, but I may be mistaken about that.
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Jack Olsen
1973 911 T (3.6) sunroof coupe
jackolsen@mediaone.net
[This message has been edited by JackOlsen (edited 04-01-2001).]