I've been considering doing the 15" wheel/tire upgrade and noticed that some
of the replacement SA alloys weigh quite a bit more than the stock 14" alloy
(18lbs) (according to GoWesty's specs).

The popular Sunburst SA wheel is listed at 19lbs - only 1lb more than stock.
But the Carat2 wheel, for example, is 23lbs...quick math...that's 5lbs and
28% heavier than the stock.  And the Rhein style wheel is 24lbs!

Which gets me thinking about the effect that weight has on performance.  I
would think the added unsprung weight (again, 28%) must have a very
significant effect on handling and suspension response.  And I've "heard"
that 1lb unsprung = 10lbs sprung.  So, 5lbs more per wheel = 20lbs more
total unprung = 200lbs sprung.  More rough calculation...that would yield
about a 1 second slower 0-60 because of rotational weight.

I hope I'm missing something here.  What are people's real
world/seat-of-pants results after going big?  It almost seems like the
benefit of the larger/wider tire (in our favorite brand) would be outweighed
by, well, weight.

Curious.

James
90 Carat